Search: id:A006960
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%I A006960 M5410
%S A006960 196,887,1675,7436,13783,52514,94039,187088,1067869,10755470,18211171,
%T A006960 35322452,60744805,111589511,227574622,454050344,897100798,1794102596,
%U A006960 8746117567,16403234045,70446464506,130992928913,450822227944,900544455998,
               1800098901007
%N A006960 Reverse and Add! sequence starting with 196.
%C A006960 a(1) = 196; a(n+1) = a(n) + a(n)-with-digits-reversed.
%D A006960 J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 196, p. 58, Ellipses, 
               Paris 2008.
%D A006960 F. Gruenberger, Computer Recreations, Scientific American, 250 (No. 4, 
               1984), 19-26.
%D A006960 R. K. Guy, What's left?, preprint, 1998.
%D A006960 Clifford A. Pickover, A Passion for Mathematics, Wiley, 2005; see p. 
               70.
%D A006960 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%H A006960 T. D. Noe, <a href="b006960.txt">Table of n, a(n) for n=0..200</a>
%H A006960 P. De Geest, <a href="http://www.worldofnumbers.com/weblinks.htm">Some 
               thematic websources</a>
%H A006960 Jason Doucette, <a href="http://www.jasondoucette.com/worldrecords.html">
               World Records</a>
%H A006960 T. Irvin, <a href="http://www.fourmilab.ch/documents/threeyears/two_months_more.html">
               About Two Months of Computing, or An Addendum to Mr. Walker's Three 
               Years of Computing</a>
%H A006960 Madras Math's Amazing Number Facts, <a href="http://www.users.zetnet.co.uk/
               madras/maths/amazingnofacts/fact044.html">The Ultimate Palindrome</
               a>
%H A006960 I. Peter, <a href="http://www.floot.demon.co.uk/palindromes.html">More 
               trajectories</a>
%H A006960 Wade VanLandingham, <a href="http://home.cfl.rr.com/p196/">196</a>
%H A006960 J. Walker, <a href="http://www.fourmilab.ch/documents/threeyears/threeyears.html">
               Three Years Of Computing: Final Report On The Palindrome Quest</a>
%H A006960 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               196-Algorithm.html">Link to a section of The World of Mathematics.</
               a>
%H A006960 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               PalindromicNumberConjecture.html">Link to a section of The World 
               of Mathematics.</a>
%H A006960 <a href="Sindx_Res.html#RAA">Index entries for sequences related to Reverse 
               and Add!</a>
%t A006960 a = {196}; For[i = 2, i < 26, i++, a = Append[a, a[[i - 1]] + ToExpression[ 
               StringReverse[ToString[a[[i - 1]]]]]]]; a
%Y A006960 Cf. A023108, A023109, A033665, A016016.
%Y A006960 Sequence in context: A089493 A088753 A063048 this_sequence A014798 A061622 
               A128990
%Y A006960 Adjacent sequences: A006957 A006958 A006959 this_sequence A006961 A006962 
               A006963
%K A006960 nonn,base,nice,easy
%O A006960 0,1
%A A006960 N. J. A. Sloane (njas(AT)research.att.com), Simon Plouffe (simon.plouffe(AT)gmail.com)
%E A006960 196 is conjectured to be smallest initial term which does not lead to 
               a palindrome. John Walker, Tim Irvin and others have extended the 
               trajectory of 196 to millions of digits without finding a palindrome.
%E A006960 More terms from Vit Planocka (planocka(AT)mistral.cz), Sep 28 2002

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