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.

A226589 Numbers k such that sigma(k) >= sigma(k-2) + sigma(k-1) + sigma(k+1) + sigma(k+2).

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%I A226589 #14 Aug 21 2025 14:34:49
%S A226589 183783600,232792560,273873600,367567200,410810400,441080640,
%T A226589 465585120,547747200,551350800,575134560,612612000,616215600,
%U A226589 698377680,735134400,745945200,821620800,845404560,882161280,908107200,931170240,944863920,958557600,1102701600,1127206080
%N A226589 Numbers k such that sigma(k) >= sigma(k-2) + sigma(k-1) + sigma(k+1) + sigma(k+2).
%C A226589 Among first 1000 terms all are such that sigma(k) > sigma(k-2) + sigma(k-1) + sigma(k+1) + sigma(k+2). - _Alex Ratushnyak_, Jun 16 2013
%H A226589 Donovan Johnson, <a href="/A226589/b226589.txt">Table of n, a(n) for n = 1..1000</a>
%e A226589 Sigma(183783598...183783602) = {275675400, 194528880, 929940480, 183783602, 275737500}. Because 929940480 > 275675400 + 194528880 + 183783602 + 275737500, 183783600 is in the sequence.
%Y A226589 Cf. A000203, A215264.
%K A226589 nonn
%O A226589 1,1
%A A226589 _Alex Ratushnyak_, Jun 12 2013