1,2

Complement of A065496.

A175432(a(n)) = 1 for n >= 1.

Table of n, a(n) for n=1..72.

Number 3 is not in sequence because sigma(3) = 4 = 2^2.

Sequence in context: A323455 A133398 A138836 * A059921 A062289 A172284

Adjacent sequences: A175428 A175429 A175430 * A175432 A175433 A175434

nonn

Jaroslav Krizek, May 10 2010

Extended by Ray Chandler, Aug 20 2010

approved