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.

A339679 Larger of amicable pair (a, b) such that the sum of their number of divisors d(a) + d(b) sets a new record.

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%I A339679 #8 Dec 13 2020 05:13:44
%S A339679 284,1210,6368,10856,14595,71145,87633,525915,1438983,1870245,5120595,
%T A339679 6088905,11791935,14084763,36939357,207429525,234587199,662939925,
%U A339679 1337154465,2450161791,4024393191,4785272037,10162493523,38437212933,160412122575,229777289469,248806975131
%N A339679 Larger of amicable pair (a, b) such that the sum of their number of divisors d(a) + d(b) sets a new record.
%C A339679 The terms are ordered according to their lesser counterparts (A339678).
%C A339679 The terms were calculated using data from Chernykh's site.
%H A339679 Amiram Eldar, <a href="/A339679/b339679.txt">Table of n, a(n) for n = 1..55</a>
%H A339679 Sergei Chernykh, <a href="http://sech.me/ap/">Amicable pairs list</a>.
%t A339679 s[n_] := DivisorSigma[1, n] - n; dm = 0; seq = {}; Do[m = s[n]; If[m > n && s[m] == n && (d = Plus @@ DivisorSigma[0,{n, m}]) > dm, dm = d; AppendTo[seq, m]], {n,1 ,10^6}]; seq
%Y A339679 Cf. A000005, A002025, A002046, A063990, A328043, A339678.
%K A339679 nonn
%O A339679 1,1
%A A339679 _Amiram Eldar_, Dec 12 2020