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.
%I A344585 #10 Jun 07 2021 21:05:04 %S A344585 6,10,14,15,21,22,26,30,33,34,35,38,39,42,46,51,55,57,58,60,62,65,66, %T A344585 69,70,74,77,78,82,84,85,86,87,90,91,93,94,95,102,105,106,110,111,114, %U A344585 115,118,119,122,123,126,129,130,132,133,134,138,140,141,142,143,145,146,150,154,155,156,158,159,161,165,166,170 %N A344585 Numbers whose sum of proper divisors (A001065) is greater than their arithmetic derivative (A003415). %C A344585 Differs from A212168 for the first time at n=100, where a(100) = 221, while A212168(100) = 220. See also comments in A211991. %H A344585 Antti Karttunen, <a href="/A344585/b344585.txt">Table of n, a(n) for n = 1..20000</a> %o A344585 (PARI) %o A344585 A003415(n) = if(n<=1, 0, my(f=factor(n)); n*sum(i=1, #f~, f[i, 2]/f[i, 1])); %o A344585 isA344585(n) = (A003415(n) < (sigma(n)-n)); %Y A344585 Cf. A001065, A003415, A212168, A344586 (complement). %Y A344585 Positions of negative terms in A211991. %K A344585 nonn %O A344585 1,1 %A A344585 _Antti Karttunen_, May 24 2021