1,2

Antisigma(n) = A024816(n) = the sum of the nondivisors of n that are between 1 and n.

Conjecture: also numbers k such that antisigma(n) = antisigma(m) = k has solution for distinct numbers n and m. - Jaroslav Krizek, Nov 10 2013

Table of n, a(n) for n=1..5.

36844389 is in the sequence because 36844389 = antisigma(8585) = antisigma(8586).

Cf. A067816 (numbers n such that antisigma(n) = antisigma(n+1)).

Sequence in context: A131678 A229687 A029983 * A154110 A235400 A028446

Adjacent sequences: A225772 A225773 A225774 * A225776 A225777 A225778

nonn

Jaroslav Krizek, Jul 26 2013

approved