A138262 Smallest positive integer m such that n divides [9^m/m] (=A129799(m)).

1, 2, 1, 2, 2, 11, 5, 2, 1, 2, 10, 11, 19, 13, 11, 11, 7, 11, 28, 2, 13, 10, 6, 11, 11, 19, 3, 13, 15, 11, 61, 13, 11, 8, 13, 11, 19, 28, 19, 2, 4, 13, 60, 10, 11, 12, 24, 11, 5, 11, 41, 19, 79, 82, 10, 13, 28, 15, 233, 11, 10, 61, 13, 17, 19, 11, 12, 8, 12, 13, 36, 11, 13, 19, 11, 37

Offset

1,2

Comments

This sequence is well-defined.

Links

Table of n, a(n) for n=1..76.

Romanian Master in Mathematics Contest, Problem 3, Bucharest, 2007.

Mathematica

spi[n_]:=Module[{m=1}, While[Mod[Floor[9^m/m], n]!=0, m++]; m]; Array[spi, 80] (* Harvey P. Dale, Jul 07 2022 *)

Crossrefs

Cf. A129799, A138255, A138256, A138257, A138258, A138259, A138260, A138261, A138263.

Sequence in context: A110775 A229232 A092186 * A276990 A127510 A328362

Adjacent sequences: A138259 A138260 A138261 * A138263 A138264 A138265

Keyword

nonn

Author

Max Alekseyev, Mar 09 2008.

Status

approved