A326414 Numbers which require exactly 288 'Reverse and Add' steps to reach a palindrome.

12000700000025339936491, 12000700001015339936491, 12000700002005339936491, 12000700010024339936491, 12000700011014339936491, 12000700012004339936491, 12000700020023339936491, 12000700021013339936491, 12000700022003339936491, 12000700030022339936491

Offset

1,1

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

Index entries for sequences related to Reverse and Add!

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: A353185 A180247 A095440 * A162033 A246254 A238360

Adjacent sequences: A326411 A326412 A326413 * A326415 A326416 A326417

Keyword

nonn,base,less

Author

Andrey S. Shchebetov and Sergei D. Shchebetov, Oct 18 2019

Extensions

Deleted an erroneous comment that said that the sequence was finite. - N. J. A. Sloane, Jun 23 2022

Status

approved