1,1

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

a(1) = 12 because sigma(A206036(1)) = sigma(6) = 12.

Cf. A159886 (values k such that sigma(x)= k has more than one solution), A206036 (numbers n such that sigma(n) = sigma(k) has solution for distinct k), A000203.

Sequence in context: A243609 A082241 A077294 * A232391 A025491 A091196

Adjacent sequences: A206418 A206419 A206420 * A206422 A206423 A206424

nonn

Jaroslav Krizek, Feb 07 2012

approved