which has 58 living cells but needs a total of 139 cells which corresponds to on-cell density of about 0.417.
. It has 49 living cells and its corresponding orphan consists of 110 cells.
On the same day he found a new record holder for minimal density of living cells of any known orphan which has 58 living cells but needs a total of 139 cells which corresponds to on-cell density of about 0.417.
As usual the challenge remains: Can you find a smaller one --- i.e. proving that your example has no predecessor in Game of Life and has fewer living cells or fewer total number of cells as any orphan? YES
Achim Flammenkamp