1,2

Rows of A114000 expressed as decimals.

Table of n, a(n) for n=1..31.

a(5)=25 converts to 11001 in binary, which has sum of digits equal to 3.

9=2*5-1 has 3 divisors.

Cf. A099774.

Sequence in context: A006722 A251413 A039774 * A306838 A171879 A171877

Adjacent sequences: A113998 A113999 A114000 * A114002 A114003 A114004

easy,nonn

Paul Barry, Nov 12 2005

approved