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 A090065 #9 Nov 30 2013 11:48:00 %S A090065 9,19,28,29,37,38,39,46,47,48,56,57,64,65,73,74,75,82,83,84,91,92,93, %T A090065 110,112,121,124,132,134,135,136,138,144,147,155,164,166,174,182,186, %U A090065 190,192,211,212,219,223,229,230,231,233,234,235,237,240,243,246,249 %N A090065 Numbers n such that there are (presumably) four palindromes in the Reverse and Add! trajectory of n. %C A090065 For terms < 2000 each palindrome is reached from the preceding one or from the start in at most 24 steps; after the presumably last one no further palindrome is reached in 2000 steps. %H A090065 <a href="/index/Res#RAA">Index entries for sequences related to Reverse and Add!</a> %e A090065 The trajectory of 134 begins 134, 565, 1130, 1441, 2882, 5764, 10439, 103840, 152141, 293392, 586784, 1074469, ...; at 1074469 it joins the (presumably) palindrome-free trajectory of A063048(72) = 90379, hence 565, 1441, 2882 and 293392 are the four palindromes in the trajectory of 134 and 134 is a term. %Y A090065 Cf. A023108, A023109, A065001, A070742, A077594. %K A090065 nonn,base %O A090065 1,1 %A A090065 _Klaus Brockhaus_, Nov 20 2003