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 A187711 Integers k which equal (product of divisors of k) mod (sum of divisors of k). 2
 2, 3, 5, 7, 10, 11, 13, 17, 19, 20, 23, 29, 31, 33, 37, 40, 41, 43, 47, 53, 59, 61, 67, 71, 73, 76, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 136, 137, 139, 145, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 207, 211, 223, 227, 229, 233, 239, 241, 251, 257, 261, 263, 269, 271, 277 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS G. C. Greubel, Table of n, a(n) for n = 1..10000 FORMULA { k : k = A187680(k) }. MAPLE isA187711 := proc(n) is(A187680(n) = n) end proc: for n from 2 to 300 do if isA187711(n) then printf("%d, ", n) ; end if; end do: # R. J. Mathar, Mar 17 2011 MATHEMATICA Select[Range[300], Mod[#^(DivisorSigma[0, #]/2), DivisorSigma[1, #]] == # &] (* G. C. Greubel, Nov 05 2018 *) CROSSREFS Cf. A000203, A007955, A187680. Sequence in context: A048461 A338174 A058590 * A064627 A324813 A235050 Adjacent sequences: A187708 A187709 A187710 * A187712 A187713 A187714 KEYWORD nonn AUTHOR Juri-Stepan Gerasimov, Mar 17 2011 STATUS approved

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Last modified September 13 00:40 EDT 2024. Contains 375857 sequences. (Running on oeis4.)