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 A092215 #7 Jul 11 2015 00:55:39 %S A092215 22,30,10,4,6,2,1,132,314,403,259,2048,-1,-1,-1,-1 %N A092215 Smallest number whose base-2 Reverse and Add! trajectory (presumably) contains exactly n base-2 palindromes, or -1 if there is no such number. %C A092215 Conjecture 1: For each k > 0 the trajectory of k eventually leads to a term in the trajectory of some j which belongs to A075252, i.e., whose trajectory (presumably) never leads to a palindrome. Conjecture 2: There is no k > 0 such that the trajectory of k contains more than eleven base 2 palindromes, i.e., a(n) = -1 for n > 11. %C A092215 Base-2 analog of A077594 (base 10) and A091680 (base 4). %H A092215 <a href="/index/Res#RAA">Index entries for sequences related to Reverse and Add!</a> %e A092215 a(4) = 6 since the trajectory of 6 contains the four palindromes 9, 27, 255, 765 (1001, 11011, 11111111, 1011111101 in base 2) and at 48960 joins the trajectory of 22 = A075252(1) and the trajectories of 1 (A035522), 2, 3, 4, 5 contain resp. 6, 5, 5, 3, 3 palindromes. %Y A092215 Cf. A035522, A006995, A075252, A077594, A091680. %K A092215 sign,base %O A092215 0,1 %A A092215 _Klaus Brockhaus_, Feb 25 2004