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A205098

Sum of proper divisors (A001065) of abundant numbers (A005101).

16, 21, 22, 36, 42, 55, 50, 54, 76, 66, 64, 108, 78, 74, 123, 90, 106, 140, 92, 144, 156, 117, 114, 106, 172, 136, 126, 240, 186, 204, 150, 196, 259, 222, 236, 218, 201, 312, 186, 196, 366, 198, 316, 203, 270, 265, 300, 226, 366, 384, 284, 234, 280, 332, 312

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OFFSET

1,1

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

Eric Weisstein's World of Mathematics, Abundant Number.

Eric Weisstein's World of Mathematics, Restricted Divisor Function.

FORMULA

a(n) = A001065(A005101(n)) = A204822(n) - A005101(n).

MATHEMATICA

f[n_] := Module[{s = DivisorSigma[1, n] - n}, If[s > n, s, Nothing]]; Array[f, 250] (* Amiram Eldar, Mar 11 2024 *)

CROSSREFS