A231545 Numbers n such that n = sigma(n) - sigma(n-1).

2, 6, 8586, 16120, 29886160

Offset: 1

Author

Jaroslav Krizek, Nov 11 2013

Keywords

• nonn

Comments

Also, numbers n such that antisigma(n) = antisigma(n-1), where antisigma(n) = A024816(n) = the sum of the non-divisors of n that are between 1 and n.

Numbers n such that A163553(n-1) = 0.

Examples

			6 is in sequence because antisigma(6) = antisigma(5) = 9.
		

Crossrefs

Cf. A067816, A024816 (antisigma(n)), A231546 (numbers n such that sigma(n) = sigma(n-1)).

Formula

a(n) = A067816(n) + 1.