A351524 - OEIS

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A351524

Number of powers of 11 modulo n.

1, 1, 2, 2, 1, 2, 3, 2, 6, 1, 2, 2, 12, 3, 2, 4, 16, 6, 3, 2, 6, 2, 22, 2, 5, 12, 18, 6, 28, 2, 30, 8, 3, 16, 3, 6, 6, 3, 12, 2, 40, 6, 7, 3, 6, 22, 46, 4, 21, 5, 16, 12, 26, 18, 2, 6, 6, 28, 58, 2, 4, 30, 6, 16, 12, 3, 66, 16, 22, 3, 70, 6, 72, 6, 10, 6, 4, 12, 39, 4, 54, 40, 41, 6, 16, 7, 28

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OFFSET

1,3

COMMENTS

This is the original version of A054711 rev. #1 as defined by Henry Bottomley, Apr 20 2000.

A054711 is now different from the sequence here.

LINKS

Alois P. Heinz, Table of n, a(n) for n = 1..10000

MATHEMATICA

a[n_] := Module[{e = IntegerExponent[n, 11]}, e + MultiplicativeOrder[11, n/11^e]]; Array[a, 100] (* Amiram Eldar, Aug 25 2024 *)

CROSSREFS

Cf. A054711.