1,1

Table of n, a(n) for n=1..64.

a(2)=4 since 2^4 < 5^2 < 2^(4+1).

(PARI) a(n) = floor(n*log(5)/log(2)) \\ Michel Marcus, Jul 27 2013

Cf. A020858.

Sequence in context: A059545 A187339 A292649 * A330118 A047292 A189930

Adjacent sequences: A061782 A061783 A061784 * A061786 A061787 A061788

nonn

Lekraj Beedassy, May 09 2003

Corrected and extended by John W. Layman, May 09 2003

approved