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 A214603 #42 Apr 29 2021 01:37:41 %S A214603 1,4,8,53,48,0,62,18,38,87,0,114,260,0,221,0,568,0,627,155,0,646,0, %T A214603 1724,695,0,282,0,1433,751,0,36460,0,949,483379914,0,8018,0,1257,0, %U A214603 1553,1858,0,4057,0,9262,3825,0,10606,0,115835,3153,0,0,0,6982 %N A214603 Location of the first gap of exactly n in Ulam numbers, or zero if none is known. The zero terms are conjectural. %C A214603 Some terms are not believed to exist. However, the first gap of 35 occurs at 483379914 and the first gap of 88 occurs at 1127544124. - _Jud McCranie_, Jul 31 2012 %H A214603 Jud McCranie, <a href="/A214603/a214603.txt">Known terms up to 890</a> %e A214603 The first gap of 5 in Ulam numbers occurs after 48, so a(5) = 48. %Y A214603 Cf. A002858, A080287, A080288. %K A214603 nonn %O A214603 1,2 %A A214603 _Jud McCranie_, Jul 22 2012