1,1

1. In these iteration chains the number of non-2-powers seem to be dominant. 2. The sequence is not monotonic.

n=10, the iteration chain of 43 terms is {6469693230,5447823150,4315810350,...,188416,98304,65536,32768,...,4,2,1,0} in which 65536 is the largest power of 2 is 2^14. For n=11 the length is 61, including 54 non-2 powers,7 powers of 2,of which the largest is 64=a(11)<a(10)=65536.

A002110, A051953.

Sequence in context: A018355 A100083 A151406 this_sequence A128055 A061285 A102000

Adjacent sequences: A053144 A053145 A053146 this_sequence A053148 A053149 A053150

more,nonn

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