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A333523 Number of iterations of Reverse And Add needed to reach a number divisible by n (or 0 if such a number is never reached). 1
1, 1, 1, 1, 1, 1, 1, 1, 1, 61, 1, 3, 8, 34, 22, 8, 17, 2, 8, 119, 14, 1, 17, 7, 110, 7, 12, 33, 34, 158, 28, 12, 1, 60, 11, 12, 50, 79, 7, 129, 64, 13, 42, 1, 4, 89, 131, 8, 14, 81, 30, 19, 125, 12, 1, 88, 13, 33, 67, 232, 26, 27, 24, 123, 59, 1, 24, 59, 36, 206, 148, 12, 217, 90, 97 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,10

COMMENTS

If n is a palindrome > 0, a(n) = 1. See A002113.

a(n) > 0 for n < 10000.

LINKS

Daniel Starodubtsev, Table of n, a(n) for n = 1..10000

EXAMPLE

a(12) = 3, because 12 takes 3 iterations (12 -> 33 -> 66 -> 132) to become 132, which is divisible by 12.

PROG

(PARI) radd(n) = fromdigits(Vecrev(digits(n)))+n; \\ A056964

a(n) = {my(i=1, k=n, x); while((x=radd(n)) % k, i++; n=x); i; } \\ Michel Marcus, Apr 11 2020

CROSSREFS

Cf. A002113, A016016, A056964.

Sequence in context: A003928 A065247 A058930 * A249909 A241601 A132096

Adjacent sequences:  A333520 A333521 A333522 * A333524 A333525 A333526

KEYWORD

nonn,base

AUTHOR

Daniel Starodubtsev, Mar 26 2020

STATUS

approved

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Last modified May 22 22:13 EDT 2022. Contains 353959 sequences. (Running on oeis4.)