1,1

Integers divisible by 1 more than the number of their divisors. The only prime is 3.

These numbers cannot be very orderly numbers (A167409). - T. D. Noe, Nov 13 2009

Table of n, a(n) for n=1..51.

Select[Range[1000], Mod[ #, 1 + DivisorSigma[0, # ]] == 0 &]

Sequence in context: A204292 A218277 A103080 * A054184 A307057 A188022

Adjacent sequences: A055717 A055718 A055719 * A055721 A055722 A055723

nonn

Robert G. Wilson v, Jun 09 2000

Edited by T. D. Noe, Nov 13 2009

approved