A181598 Numbers m with divisor 8 | m and abundance sigma(m)-2*m = 8.

56, 368, 11096, 17816, 77744, 128768, 2087936, 2291936, 13174976, 35021696, 45335936, 381236216, 4856970752, 6800228816, 8589344768, 1461083549696, 1471763808896, 2199013818368, 19502341651712, 118123076415296, 933386556194816, 144141575952121856, 417857739454939136

Offset: 1

Author

Vladimir Shevelev, Nov 01 2010

Keywords

• nonn

Comments

a(19) > 10^13. - Giovanni Resta, Apr 02 2014

Crossrefs

Cf. A008590, A088833, A097498, A181595, A181596, A181597, A118372, A045768, A000396, A005101, A153501, A005820.

Programs

PARI

isok(n) = !(n % 8) && (sigma(n) - 2*n == 8); \\ Michel Marcus, Feb 08 2016

Formula

A088833 INTERSECT A008590. - R. J. Mathar, Nov 04 2010

Extensions

Definition rephrased by R. J. Mathar, Nov 04 2010

a(16)-a(17) from Donovan Johnson, Dec 08 2011

a(18) from Giovanni Resta, Apr 02 2014

a(19)-a(23) from the b-file at A088833 added by Amiram Eldar, Mar 11 2024