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 A272685 #9 May 24 2016 15:46:51 %S A272685 1,15,14,13,12,217,0,215,45,213,44,43,209,42,207,2,573,1327,572,130, %T A272685 185,570,1492,569,78,568,128,567,1318,1498,565,188,564,10,563,1312, %U A272685 562,1504,1309,560,1507,693,74,558,1510,557,192,2360,6085,350,1480,708,6083,3643 %N A272685 a(n) = smallest m such that A265432(m) = A272684(n), or -1 if no such m exists. %C A272685 It is conjectured that all terms of A272684 eventually appear in A265432. %C A272685 See A273369 for a version that ignores the fact that terms in A272671 ending in 0 cannot appear in A265432. %e A272685 A272684(1) = 6 first appears in A265432 at index 1, so a(1) = 1. %e A272685 A272684(7) = 225 first appears in A265432 at index 0, so a(7) = 0. %Y A272685 Cf. A272684, A272671, A265432. %Y A272685 See A273369 for another version. %K A272685 nonn,base %O A272685 1,2 %A A272685 _Nathan Fox_, _Brooke Logan_, and _N. J. A. Sloane_, May 24 2016