1,1

There are large gaps in this sequence. For any n>=2 the number 2^2n - 2^n + 1 and the following 2^2n + 2^(n+1) - 3 natural numbers will definitely not occur in this sequence.

Table of n, a(n) for n=1..37.

Cf. A091821.

Sequence in context: A034166 A301338 A181495 * A216814 A180427 A127591

Adjacent sequences: A092364 A092365 A092366 * A092368 A092369 A092370

base,easy,nonn

Frank Schwellinger (nummer_eins(AT)web.de), Mar 19 2004

approved