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 A109867 a(1) = 12; for n >= 1, a(n+1) = {a(n)+R(a(n)}*{a(n)-R(a(n)}, where R(k) is the digit reversal of k. 0
 12, 297, 539055, 12949081200, 167631138529627443759, 888408727567955042239409874101472777521040, 787659989217062162749912989661115208857840881836480202901460330472578518132645989056 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The next term has 168 digits. - Harvey P. Dale, Dec 01 2017 LINKS EXAMPLE a(2) = (12 + 21)*(21 - 12) = 297. MATHEMATICA a = {12}; For[n = 2, n < 10, n++, AppendTo[a, Abs[(a[[ -1]] + FromDigits[Reverse[IntegerDigits[a[[ -1]]]]])* (a[[ -1]] - FromDigits[Reverse[IntegerDigits[a[[ -1]]]]])]]]; a (* Stefan Steinerberger, Jun 05 2007 *) NestList[(#+IntegerReverse[#])Abs[#-IntegerReverse[#]]&, 12, 10] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Dec 01 2017 *) CROSSREFS Sequence in context: A220307 A223011 A245915 * A326437 A303068 A014130 Adjacent sequences:  A109864 A109865 A109866 * A109868 A109869 A109870 KEYWORD base,nonn AUTHOR Amarnath Murthy, Jul 09 2005 EXTENSIONS Corrected and extended by Stefan Steinerberger, Jun 05 2007 STATUS approved

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Last modified July 3 13:57 EDT 2022. Contains 355055 sequences. (Running on oeis4.)