1,2

Table of n, a(n) for n=1..60.

(PARI) forstep(m=1, 10^6, 2, n=sqrtint(2^m-1); if(2^m-1-n^2<n, print1(m, ", ")))

Cf. A000225, A017910, A144932

Sequence in context: A120687 A194468 A053217 * A166257 A192992 A335652

Adjacent sequences: A144928 A144929 A144930 * A144932 A144933 A144934

nonn

Reikku Kulon, Sep 25 2008

Edited and extended by Max Alekseyev, Oct 12 2009

approved