A015991 Numbers such that ten iterations of Reverse and Add are needed to reach a palindrome.

829, 928, 9059, 9149, 9239, 9329, 9419, 9509, 9599, 9689, 9779, 9869, 9959, 10634, 10637, 10687, 10716, 10808, 10834, 10838, 10867, 10873, 10898, 10927, 10979, 11398, 11624, 11627, 11677, 11706, 11824, 11828, 11857, 11863, 11888

Offset: 1

Author

Robert G. Wilson v

Keywords

• nonn
• base

Comments

The number of iterations starts at 1, so palindromes (cf. A002113) are not excluded. The corresponding sequence excluding palindromes is A065215.

Links

• Index entries for sequences related to Reverse and Add!

Crossrefs

Cf. A002113. Different from A065215.

Programs

Mathematica

tiraQ[n_]:=Rest[Boole[PalindromeQ/@NestList[#+IntegerReverse[#]&,n,10]]]=={0,0,0,0,0,0,0,0,0,1}; Select[Range[12000],tiraQ] (* Harvey P. Dale, May 11 2019 *)