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 A161496 #26 Oct 18 2024 08:36:30 %S A161496 0,0,1,1,3,4,4,7,15,22,26,31,130,151,319,550,570,804,1063,1105,2422, %T A161496 2485,2803,4984,5425,5802,11124,21560,27625,33012,54022,189209,214858, %U A161496 314446,349567,744055,755344,1743148,3366729,5249002,6009145,6491237,7600614,8145664,9289166 %N A161496 Number of zeros in n-th even perfect number written in base 16. %H A161496 Amiram Eldar, <a href="/A161496/b161496.txt">Table of n, a(n) for n = 1..48</a> (terms 1..47 from Ivan Panchenko) %F A161496 a(n) = floor((A000043(n)-1)/4). - _Gerson Washiski Barbosa_, May 29 2011 %Y A161496 Cf. A000396, A135650, A160962, A161323. %K A161496 nonn,base %O A161496 1,5 %A A161496 _Juri-Stepan Gerasimov_, Jun 11 2009 %E A161496 Definition changed (inserting the word "even"), a(31) corrected and a(41)-a(45) added by _Ivan Panchenko_, Aug 04 2018