A292626 Numbers n whose abundance is 128: sigma(n) - 2n = 128.

860, 5336, 6536, 9656, 16256, 55796, 70864, 98048, 361556, 776096, 2227616, 4145216, 4498136, 4632896, 8124416, 13086016, 34869056, 38546576, 150094976, 172960856, 196066256, 962085536, 1080008576, 1733780336, 2143256576, 9677743616, 11276687456, 21568135616

Offset

1,1

Links

Table of n, a(n) for n=1..28.

Mathematica

fQ[n_] := DivisorSigma[1, n] == 2 n + 128; Select[ Range@ 10^8, fQ] (* Robert G. Wilson v, Nov 19 2017 *)

Prog

(PARI) isok(n) = sigma(n) - 2*n == 128; \\ Michel Marcus, Sep 20 2017

Crossrefs

Cf. A088831, A088832, A088833, A141547, A175989, A275996.

Subsequence of A259174.

Sequence in context: A108822 A278156 A249461 * A115749 A105323 A206756

Adjacent sequences: A292623 A292624 A292625 * A292627 A292628 A292629

Keyword

nonn

Author

Fabian Schneider, Sep 20 2017

Extensions

a(9)-a(18) from Michel Marcus, Sep 20 2017

a(19)-a(28) from Robert G. Wilson v, Nov 20 2017

Status

approved