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 A326414 Numbers which require exactly 288 'Reverse and Add' steps to reach a palindrome. 1
 12000700000025339936491, 12000700001015339936491, 12000700002005339936491, 12000700010024339936491, 12000700011014339936491, 12000700012004339936491, 12000700020023339936491, 12000700021013339936491, 12000700022003339936491, 12000700030022339936491 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The sequence starts with 12000700000025339936491 (the number discovered by Rob van Nobelen on April 26, 2019), ends with 29463993352000000700020 and contains 19353600 terms known at present. REFERENCES Popular Computing (Calabasas, CA), The 196 Problem, Vol. 3 (No. 30, Sep 1975). LINKS Sergei D. Shchebetov, Table of n, a(n) for n = 1..10000 Jason Doucette, World Records Yutaka Nishiyama, Numerical Palindromes and the 196 Problem, International Journal of Pure and Applied Mathematics, Volume 80, No. 3, 2012, 375-384. Sergei D. Shchebetov, 19353600 terms (zipped file) R. Styer, The Palindromic Conjecture and the Fibonacci Sequence, Villanova University, 1986, 1-11. C. W. Trigg, Palindromes by Addition, Mathematics Magazine, 40 (1967), 26-28. C. W. Trigg, More on Palindromes by Reversal-Addition, Mathematics Magazine, 45 (1972), 184-186. Wikipedia, Lychrel Number 196 and Other Lychrel Numbers, 196 and Lychrel Number FORMULA Each term requires exactly 288 steps to turn into a 142-digit palindrome. CROSSREFS Cf. A023109, A033672, A065198, A065199, A065320, A065321, A065322, A065323, A065324, A065325, A065326, A065327, A070743, A072216, A072217, A072218, A281301, A281390, A281506, A281507. Sequence in context: A171265 A180247 A095440 * A162033 A246254 A238360 Adjacent sequences:  A326411 A326412 A326413 * A326415 A326416 A326417 KEYWORD nonn,base AUTHOR Andrey S. Shchebetov and Sergei D. Shchebetov, Oct 18 2019 STATUS approved

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Last modified February 23 12:38 EST 2020. Contains 332159 sequences. (Running on oeis4.)