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 A269739 #10 Mar 19 2016 00:11:38 %S A269739 1,2,4,9,72,80,87,175,180,186,197,203,208,217,221,228,239,255,258,259, %T A269739 569,570,660,661,666,690,693,841,842,881,898,1663,1672,1734,1757,1762, %U A269739 1763,1784,1800,1801,1811,2039,2057,3725,3732,3737,3738,3741,3751,3760,3801,3833,3858,7779,7787,7993 %N A269739 Index in A092243 where n first appears. %C A269739 Although there may not yet be a proof that every positive or negative integer appears in A092243, it seems likely that this will be true. %H A269739 Chai Wah Wu, <a href="/A269739/b269739.txt">Table of n, a(n) for n = 0..3608</a> %Y A269739 Cf. A079054, A092243, A269738. %K A269739 nonn %O A269739 0,2 %A A269739 _N. J. A. Sloane_, Mar 13 2016