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

1,1

Comments

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

Links

Table of n, a(n) for n=1..35.

Index entries for sequences related to Reverse and Add!

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 *)

Crossrefs

Cf. A002113. Different from A065215.

Sequence in context: A226536 A099052 A238024 * A065215 A252988 A366704

Adjacent sequences: A015988 A015989 A015990 * A015992 A015993 A015994

Keyword

nonn,base

Author

Robert G. Wilson v

Status

approved