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 A077406 #23 Feb 15 2019 03:09:37 %S A077406 0,3,5,15,17,53,1466,9717,32857,37340,37366,37367,531773,1596329 %N A077406 In base 3: n sets a new record for the number of Reverse and Add! steps needed to reach a palindrome starting with n. %C A077406 RECORDS transform of A077402. - Base-3 analog of A066144 (base 2), A075686 (base 4) and A065198 (base 10). Integers like 103, for which a palindrome is (presumably) never reached (cf. A077404), are of course disregarded. A077407 gives the corresponding records. %H A077406 N. J. A. Sloane, <a href="/transforms.txt">Transforms</a> %H A077406 <a href="/index/Res#RAA">Index entries for sequences related to Reverse and Add!</a> %e A077406 Starting with 15, 3 Reverse and Add! steps are needed to reach a palindrome; starting with n < 15, less (at most 2) steps are needed. %Y A077406 Cf. A065198, A066144, A075686, A077402, A077404, A077407. %K A077406 base,more,nonn %O A077406 1,2 %A A077406 _Klaus Brockhaus_, Nov 05 2002 %E A077406 a(14) from _Sean A. Irvine_, Apr 19 2010