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 A090069 #9 Nov 30 2013 11:48:46 %S A090069 3,8,20,22,100,101,116,122,139,151,160,215,221,238,313,314,320,337, %T A090069 343,413,436,512,611,634,696,710,717,727,733,832,931,1004,1011,1070, %U A090069 1101,1160,1250,1340,1430,1520,1610,1700,1771,2000,2002,2003,2010,2100,2112 %N A090069 Numbers n such that there are (presumably) eight palindromes in the Reverse and Add! trajectory of n. %C A090069 For terms <= 5000 each palindrome is reached from the preceding one or from the start in at most 15 steps; after the presumably last one no further palindrome is reached in 2000 steps. %H A090069 <a href="/index/Res#RAA">Index entries for sequences related to Reverse and Add!</a> %e A090069 The trajectory of 8 begins 8, 16, 77, 154, 605, 1111, 2222, 4444, 8888, 17776, 85547, 160105, 661166, 1322332, 3654563, 7309126, ...; at 7309126 it joins the (presumably) palindrome-free trajectory of A063048(7) = 10577, hence 8, 77, 1111, 2222, 4444, 8888, 661166 and 3654563 are the eight palindromes in the trajectory of 8 and 8 is a term. %Y A090069 Cf. A023108, A023109, A065001, A070742, A077594. %K A090069 nonn,base %O A090069 1,1 %A A090069 _Klaus Brockhaus_, Nov 20 2003