1,2

In these iteration chains the number of non-2-powers seem to be in majority.

n=6, A002110(6)=30030; the corresponding iteration chain is: {30030,24270,17806,9238,4798,2400,1760,1120,736,384,256,128,64,32,16,8,4,2,1,0}. It has 20 terms, among which entries from the first to 10th, also the last 0, are not powers of 2, so a(6)=11.

A002110, A051953.

Sequence in context: A064469 A057700 A136103 this_sequence A056675 A062857 A061799

Adjacent sequences: A053143 A053144 A053145 this_sequence A053147 A053148 A053149

more,nonn

Labos E. (labos(AT)ana.sote.hu), Feb 28 2000