cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A088845 Multiply perfect numbers k for which the quotient sigma_5(k)/k = A001160(k)/k is nonintegral.

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%I A088845 #19 May 09 2024 02:51:57
%S A088845 496,523776,23569920,142990848,275502900594021408,622286506811515392,
%T A088845 71065075104190073088,34384125938411324962897920,
%U A088845 41254809330254618094796800000,2360137508360958913826987704320,11990459635691909131039408128000,24862223033124742964111030747136
%N A088845 Multiply perfect numbers k for which the quotient sigma_5(k)/k = A001160(k)/k is nonintegral.
%H A088845 Amiram Eldar, <a href="/A088845/b088845.txt">Table of n, a(n) for n = 1..369</a>
%o A088845 (PARI) lista() = {v = readvec("b007691.txt"); for (i=1, #v, vi = v[i]; if (sigma(vi, 5) % vi, print1(vi, ", ");););} \\ _Michel Marcus_, Dec 26 2013
%Y A088845 Cf. A007691, A001158, A001160, A066269, A088843, A088844.
%K A088845 nonn
%O A088845 1,1
%A A088845 _Labos Elemer_, Nov 05 2003
%E A088845 Extended using A007691 b-file by _Michel Marcus_, Dec 26 2013
%E A088845 Data corrected by _Amiram Eldar_, May 09 2024