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A015976 One iteration of Reverse and Add is needed to reach a palindrome. 4
1, 2, 3, 4, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 21, 22, 23, 24, 25, 26, 27, 29, 30, 31, 32, 33, 34, 35, 36, 38, 40, 41, 42, 43, 44, 45, 47, 50, 51, 52, 53, 54, 56, 60, 61, 62, 63, 65, 70, 71, 72, 74, 80, 81, 83, 90, 92, 100, 101, 102, 103, 104, 105, 106 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The number of iterations starts at 1, so palindromes (cf. A002113) are not excluded. The corresponding sequence excluding palindromes is A065206.

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Index entries for sequences related to Reverse and Add!

MATHEMATICA

rev[n_] := FromDigits[Reverse[IntegerDigits[n]]]; Select[Range[106], rev[x = # + rev[#]] == x &] (* Jayanta Basu, Jul 24 2013 *)

PROG

(Haskell)

a015976 n = a015976_list !! (n-1)

a015976_list = filter ((== 1) . a136522 . a056964) [1..]

-- Reinhard Zumkeller, Oct 14 2011

CROSSREFS

Cf. A002113, A065206.

Sequence in context: A193858 A054930 A119798 * A098892 A174139 A037325

Adjacent sequences:  A015973 A015974 A015975 * A015977 A015978 A015979

KEYWORD

nonn,base,look

AUTHOR

Robert G. Wilson v

EXTENSIONS

Offset corrected by Reinhard Zumkeller, Oct 14 2011

STATUS

approved

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Last modified May 19 16:36 EDT 2019. Contains 323395 sequences. (Running on oeis4.)