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 A165495 #7 Jun 02 2025 02:04:43 %S A165495 7,38,71,122,178,265,415,486,602,799,927,1230,1321,1486,1810,1951, %T A165495 2214,2474,2830,3194,3386,3738,4206,4639,4874,5358,5838,6222,6534, %U A165495 7101,7482,8145,8570,9010,9722,10922,10922,11434,11882,12571,13274 %N A165495 First result not divisible by 4 when iterating k -> k+tau(k) from 2(2n-1)^2. %C A165495 This sequence and A165494 explore a critical aspect of the behavior of A064491. %e A165495 For a(2) we start at 2.3^2=18; 18+tau(18)=24; 24+tau(24)=32; 32+tau(32)=38, which is not divisible by 4, so a(2)=38. %Y A165495 Cf. A064491, A165494, A165496 %K A165495 easy,nonn %O A165495 1,1 %A A165495 _Hugo van der Sanden_, Sep 21 2009