A015991 - OEIS

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

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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