Shortest Addition Chains
Introduction
A finite sequence of positive integers a_{0}, a_{1}, ..., a_{r} is called an addition chain iff for
each element a_{i}, but the first a_{0} which equals 1, there exist elements in the list with smaller indexes j and k such that a_{i} = a_{j} + a_{k}.
Preciser this is called an addition chain of length r for its last number a_{r}. It can be interpreted like calculating n = a_{r}
starting from 1 by addition of only previous calculated numbers.
Let us restrict the definition a bit more: addition chains should be strictly
monotonic increasing.
This can be achived by reordering and dropping multiple numbers. As a consequence a_{1}=2 and a_{2}=3 or 4 always (as long as r > 1).
Now ask for the minimal length of an addition chain for a given number n and call this value l(n). If we demand that j or k equals i1 for all positive indices i  each a_{i} in the chain requires the previous a_{i1}, we call such a chain a starchain and denote its minimal length by l^{*}(n).
I highly recommand Knuth's survey in section 4.6.3 of The Art of Computer Programming, Volume 2: Seminumerical Algorithmus (3. edition appeared 1997).
To illustrate shortest addition chains for each n < 149
one may track the path from the root 1 to the corresponding node n in the following tree:
Such a tree can't be extended gapless to larger n because in the triple 43, 77, 149
any two numbers exclude the third for a shortest addition chain representation in a common tree.
Lower and Upper Bounds of l(n)
Write n in its binary representation and denote by v(n) the
number of ones in this representation and by λ(n) the binary logarithm of n rounded to the next integer down in the case it is not already integer (floorfunction).
Then it is obvious through construction of an addition chain according by the russian multiplication, that l(n) <=
λ(n) + v(n)  1. An open conjecture states a lower limit of λ(n) + log_{2}(v(n)).
Notation
Notice: The definitions of v(n) and λ(n) are given in the previous paragraph.
 s(n)
 the number of small steps of n defined as the difference of the length of its shortest addition chain and the binary logarithm (rounded down).
s(n) = l(n)λ(n)
 Double step
 a_{i} = a_{i1} + a_{i1}
 Star step
 a_{i} = a_{i1} + a_{j} with j < i
 Small step
 λ(a_{i}) = λ(a_{i1})
 Standard step
 a_{i} = a_{j} + a_{k} with i > j > k
 L(r)
 the set of numbers which have a shortest addition chain of length r
L(r) = { i: l(i)=r }
 c(r)
 the smallest number which has a shortest addition chain of length r
c(r) = min L(r)
 2^{r}
 the largest number which has an addition chain of length r
2^r = max L(r) holds trivally
 m(r)
 the median of numbers which have a shortest addition chain of length r
m(r) = med L(r)
 μ(r)
 the arithemtic average of numbers which have a shortest addition chain of length r
μ(r) = 1/d(r) ∑_{i ∈ L(r)} i
 g(r)
 the geometric average of numbers which have a shortest addition chain of length r
g(r) = exp( 1/d(r) ∑_{i ∈ L(r)} ln i )
 p(r)
 the "most probable" number which has a shortest addition chain of length r
p(r) = i: f_{r}(i) = max_{h} f_{r}(h) with f_{r}(i) = ∑_{k ∈ N} { j ∈ L(r): ij=k }/4^{k}
 σ(r)
 the standard deviation of the numbers which have a shortest addition chain of length r
σ^{2}(r) = 1/d(r) ∑_{i ∈ L(r)} i^{2}  μ(r)^{2}
 d(r)
 the number of numbers which have a shortest addition chain of length r
d(r) =  L(r) 
Table of Characterizing Values
r  c(r)  s(c(r))  v(c(r))  μ(r)  g(r)  m(r)  p(r)  σ(r)  d(r)  L(r) 

0  1  0  1  1.0  1.0  1=  1  0  1  {1} 
1  2  0  1  2.0  2.0  2=  2  0  1  {2} 
2  3  1  2  3.5  3.5  3+  3+  0.5  2  {3,4} 
3  5  1  2  6.3  6.2  6=  6  1.2  3  {5,6,8} 
4  7  2  3  10.8  10.4  10=  10  3.1  5  {7,9,10,12,16} 
5  11  2  3  18.2  17.3  17=  14  6.1  9  {11,13,14,15,17,18,20,24,32} 
6  19  2  3  31.7  30.1  28=  26  11.4  15  {19,21,22,23,25,26,27,28,30,33,34,36,40,48,64} 
7  29  3  4  54.5  51.3  49+  43  21.2  26 
8  47  3  5  94.6  88.5  84+  84  39.0  44 
9  71  3  4  162.4  151.0  147+  116  70.5  78 
10  127  4  7  283.1  262.8  248+  230  125.6  136 
11  191  4  7  491.5  456.1  435+  455  220.8  246 
12  379  4  7  869.8  809.4  781+  840  387.5  432 
13  607  4  7  1535.4  1429.4  1372+  1136  682.3  772 
14  1087  4  7  2725.8  2540.0  2461+  2028  1201.5  1382 
15  1903  5  9  4855.4  4527.9  4379=  4047  2122.4  2481 
16  3583  5  11  8672.1  8097.2  7813+  6832  3748.3  4490 
17  6271  5  9  15571.7  14570.0  14101+  12048  6611.3  8170 
18  11231  5  11  28094.6  26343.0  25641+  24096  11694.2  14866 
19  18287  5  10  50861.7  47784.4  46466+  48156  20748.0  27128 
20  34303  5  11  92379.2  86937.2  84764+  89120  36960.6  49544 
21  65131  6  12  168192.7  158468.7  154745=  146480  66224.1  90371 
22  110591  6  15  306531.6  289025.3  282128+  290858  119165.8  165432 
23  196591  6  16  559476.7  527913.7  514285=  520240  215048.9  303475 
24  357887  6  15  1023051.3  966288.1  942710=  1155126  388500.7  558275 
25  685951  6  15  1874869.1  1772876.3  1732716+  2310196  702737.4  1028508 
26  1176431  6  14  3443135.0  3259501.8  3191985+  2801503  1273563.8  1896704 
27  2211837  6  16  6333417.2  6001516.0  5881151=  5612462  2313684.8  3501029 
28  4169527  7  17  11667084.1  11064752.4  10848521+  9412704  4214352.7  6465774 
29  7624319  7  15  21516285.2  20418193.4  20044424+  16905070  7697737.3  11947258 
30  14143037  7  16  39714338.9  37704137.9  37013874=  41615456  14098404.4  22087489 
31  25450463  7  15  73345796.7  69658962.3  68327129+  83230816  25868797.8  40886910 
32  46444543  7  18  135563778.8  128804664.5  126581547+  132022368  47516034.6  75763102 
33  89209343  7  18  250780403.3  238406628.4  234114742=  284950635  87306216.3  140588339 
34  155691199  7  16  464437430.0  441801858.5  434295820+  397507456  160480247.6  261070184 
35  298695487  7  19  861008497.3  819556624.5  806226456+  680509066  295231415.9  485074788 
36  550040063  7  17  1597540092.5  1521468390.1  1497772469+  1511488768  543803959.0  901751654 
37  994660991  8  18       1677060520 
38  1886023151  8  19       3119775195 
39  3502562143  8  18       5804404206 
40  6490123999  8  21       10804952217 
41  11889505663  8  21       
42  22899028607  8  21       
43  41866170239  8  25       
In the median column the sign = means the value is unique and the character + indicates it lies between the
given index and the next index with this rvalue because d(r) is even.
With bold font in the previous c(r)column the sequence of smallest numbers n_{i} is highlighted which need at least i= s(c(r)) small steps in their addition chain:
1,3,7,29,127,1903,65131,4169527,994660991,....
Moreover here are the graphs of c(r) and d(r) together with an approximation function plotted.
And the quotient of c(r) and d(r) with the asymptotic approximation function.
Finally the distribution of the number of shortest addition chains with fixed small step number depending on the range of λ(n).
Generally Solved Small Step Cases
 0smallstep case
 Trivial
For each n >= 0 there is exactly 1 0smallstep number in the halfopen interval [2^n,2^(n+1)[ .
 list of all 0smallstep numbers:
2^n
 shortest chains for 0smallstep numbers:
0( ) 1
1( 0, D) @(A)
Here @(A) means 2^A with A a free nonnegative integer variable
 1smallstep case
 <= 1894 solved
 2smallstep case
 <= 1973 solved
 3smallstep case
 1991 solved
History: What was calculated When and by Whom
 l(i) with i <= 50 and d(r) with r <=6
calculated March 1957 by W. Hansen
 l(i) with i <= 2^{10} and d(r) with r <=11
reported December 1963 by D. E. Knuth
 l(i) with i < 2000 and d(r) with r <= 12
reported October 1968 by D. E. Knuth
 l(i) with i < 11232 and d(r) with r <= 15
calculated until May 1973 by D. E. Knuth
 l(i) with i < 120000 and c(r) with r <= 22
computed until August 1988 by Achim
 l(i) with i < 2^{17} and d(r) with r <= 20
computed April 1991 by Achim
 l(i) with i < 2^{18} and d(21) and c(23)
computed until October 1991 by Achim
 l(i) with i <= 500000 and c(24)
computed until November 1995 by D. Bleichensbacher
 l(i) with i <= 720000 including c(25)
computed until end of March 1997 by Achim.
 l(i) with i <= 2^{22} including c(28) and d(r) with r <= 25
computed until August 1997 by Achim.
 l(i) with i <= 2^{22} and d(25) and d(26)
computed until August 2004 by Neill Clift
 l(i) with i <= 2^{23} and d(27) and c(29) and c(30)
computed until September 2004 by Neill Clift
 l(i) with i <= 2^{24}
computed until December 2004 by Neill Clift
 c(31)
computed December 2005 by Neill Clift
 l(i) with i <= 2^{25}
computed until April 2006 by Neill Clift
 d(29), d(30) and c(32)
computed until June 2007 by Neill Clift
 l(i) with i <= 2^{26}
computed until May 2008 by Neill Clift
 d(31), d(32) and c(33)
computed until May 2008 by Neill Clift
 l(i) with i <= 2^{27} and l(i) with i <= 2^{28} and l(i) with i <= 2^{29}
computed in May 2008 by Neill Clift
 d(33), c(34) and c(35)
computed in May 2008 by Neill Clift
 c(36), d(34) and d(35)
computed June 2008 by Neill Clift
 c(37) and l(i) with i <= 2^{30}
computed until July 2008 by Neill Clift
 d(36)
computed in July 2008 by Neill Clift
 c(38)
computed in July 2008 by Neill Clift
 l(i) with i <= 2^{31}
computed until August 2008 by Neill Clift
 d(37)
computed in August 2008 by Neill Clift
 c(39)
computed in September 2008 by Neill Clift
 l(i) with i <= 2^{32}
computed until October 2008 by Neill Clift
 d(36), d(37) and d(38)
computed in November 2008 by Neill Clift
 c(40)
computed in September 2009 by Neill Clift
 l(i) with i <= 2^{33}
computed until October 2009 by Neill Clift
 c(41)
computed in November 2009 by Neill Clift
 l(i) with i <= 2^{34}
computed until December 2009 by Neill Clift
 c(42)
computed in May 2016 by Neill Clift
 l(2^{n}1) = n + l(n)  1 with n ∈ {65,66,68,72,80,96}
proved in May 2016 by Neill Clift
 l(i) with i <= 2^{35}
computed until May 2016 by Neill Clift
 d(39)
computed in May 2016 by Neill Clift
 d(40)
computed in May 2016 by Neill Clift

c(43)
computed in September 2016 by Neill Clift

l(i) with i <= 2^{36}
computed until October 2016 by Neill Clift
In July 2004 the data calculated 1997 by Flammenkamp was completely and independently checked.
Hereby Neill Clift uncovered four l(n)errors, which he attributed to a typo
in Flammenkamp's program effecting only nvalues > 2500000.
On 30th May 2008, Neill Clift discovered the first and smallest n such that l(n) > l(2n).
Data Access
Thanks to Neill Clift's computations
you can download the lengths of all shortest additions chains for n up to n=2^{31}
as bziped2 binary data of 210 MB size. The uncompressed values are coded as l(n)λ(n)ceil(log_{2}(v(n))) into 2 bits each which the exception of l(2135101487) ^{#}.
To decipher this you can download ddt.c compile it and run it as ddt inputfile linelength.
You will get all values starting from 1 and broken into lines each
containing linelength values onto your stdout from the base36 alphabet (0,1,2,..,9,a,b,c,..,z) or as a 1 or 2 digit decimal value.
A second helper l.c outputs l(n), λ(n), s(n) and v(n) for each given input n which data is in the datafile.
Now you can download all l(n) with n <= 2^{33} as bziped2 binary data of 820 MB size.
To display these you must also download ddt4l.c, compile it and run it as ddt4l datafile [first n [total number [linelength] ] ].
You will get all or total numbermany values starting from 1 or first n and broken into lines each
containing linelength values onto your stdout from the base42 alphabet (0,1,2,..,9,a,b,c,..,z,A,B,C,..,F).
Now you can download all l(n) with n <= 2^{35} as bziped2 binary data of 3197 MB size.
To display these you must also download ddt4ln.c, compile it and run it as ddt4ln datafile [O?] [first n [total number [linelength] ] ].
You will get all or total numbermany values starting from 1 or first n and broken into lines (or pages) each
containing linelength values onto your stdout.
This ? after the O controls the output format and must take values ∈ {0,1,2,3,4}.
The default is 0 and means no output, but data integrity check only. Thus in generally you will need this outputoption.
The options O1 and O2 are the old formats known from ddt and ddtl4.The parameter O4 produces a format very similar to this of the above old helperprogram l.
Now you can download all l(n) with n <= 2^{36} as bziped2 binary data of 6397 MB size.
To display these you must also use ddt4ln.c like in the case of the 2^{35}many values.
Look up in the database of the first 2^{31} many l(n) values
The effort to compute these values up to n=2^{20} is here visible.
The number of cases checked to get l(n) is plotted in red against λ(n) for each number 2^{8} <= n < 2^{20}.
In blue the number of cases are marked to compute n=c(r) and finally in
dark green the average number of cases is drawn which is needed to calculate l(n)
for all numbers from 1 up to n (the last gives a good estimate of the average run time of the algorithm).
Generate a Shortest Addition Chain for any given number < 2^{27}
^{#} The smallest n such that l(n)λ(n)ceil(log_{2}(v(n))) equals 0,1,2,3,4,... are 1, 29, 3691, 919627, 2135101487, ... .
Conjectures
 l(2^{n}1) <= n + l(n)  1
 The outstanding ScholzBrauerConjecture of 1937. If l(n) is achievable by a star chain then it holds. Therefore only values of n need to be considered with l(n) < l^{*}(n). But the smallest of these numbers is 12509.
In August 2005 Clift reported to have confirmed the ScholzBrauer inequality for all n < 5784689. ^{+}
 l(2^{n}1) = n + l(n)  1
 This narrow related equation is proved only for n <= 66 and n=68,72,80,96
^{*}.
 l(n) >= λ(n)+log_{2}(v(n))
 This famous lower bound was formulated first a bit differently by Stolarsky 1969 and
nearly proved 1974 by Schönhage who showed that l(n) >= log_{2}(n)+log_{2}(v(n))2.123164629... holds for each n.
Thurber showed 1973 that it holds for all n with v(n) <= 16.
In October 2008 Clift confirmed the conjecture for all n <= 2^{64}.
 log_{2}(c(r)) ~ r  r/log_{2}r
 That is the 1997 stated conjecture by Flammenkamp for the asymptotic growth of c(r)
outdating the 1991 given assertation that log_{2}(c(r)) ~ r  2log_{2}r.
 Computing l(n) for given n is NPhard.
 Downey, Leony and Sethi didn't prove anything about this statement in their
1981 SIAM article. They proved a similar one, if a set of numbers is given!
Many people (and even experts) overlooked this important difference!
 d(r) <= d(r+1) <= 2d(r)
 Already 1981 D. Knuth stated "there is no evident way to prove that d(r) is an increasing function in r".
^{+}This number 5784689 = 2^{22}+97*2^{14}+65*2^{4}+97 is also the smallest NonHansen number (also identified by Neill Clift in 2005 as such).
^{*}In August 2005 Neill Clift reported to have proved equality without any further assumption for all n <= 28 and n = 30. Furthermore in December 2007 he showed equality without any further assumption even for n = 29. Moreover until May 2009 he proved it for all n <= 64 and in May 2016 for n ∈ {65,66,68,72,80,96}.
Unsorted new stuff
 An equivalent definition of addition chains based only on the settheoretic definition of natural numbers: additive complexity
 K. Stolarsky uses infinite addition chains in his 1969 appeared paper. Here are some basic remarks about minimal infinite addition chains.
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Method",
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2011, pp 265284
legend:
# reviewed journal article
# thesis
# report, memorandum, paper
# conference proceedings
# monography
# unclassified or other
I like to thank Neill Clift, Kirkland, Washington, U.S.A., for far the most references in the preceeding bibliography list.
Achim Flammenkamp
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