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A205098
Sum of proper divisors (A001065) of abundant numbers (A005101).
3
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
OFFSET
1,1
LINKS
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
Cf. A205099 (sum of proper divisors of deficient numbers), A204822 (sum of divisors of abundant numbers), A001065, A005101.
Sequence in context: A094329 A070573 A186462 * A290142 A165160 A180411
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Jan 22 2012
STATUS
approved