A054710 Number of powers of 10 mod n.

1, 2, 1, 3, 2, 2, 6, 4, 1, 2, 2, 3, 6, 7, 2, 5, 16, 2, 18, 3, 6, 3, 22, 4, 3, 7, 3, 8, 28, 2, 15, 6, 2, 17, 7, 3, 3, 19, 6, 4, 5, 7, 21, 4, 2, 23, 46, 5, 42, 3, 16, 8, 13, 4, 3, 9, 18, 29, 58, 3, 60, 16, 6, 7, 7, 3, 33, 18, 22, 7, 35, 4, 8, 4, 3, 20, 6, 7, 13, 5, 9, 6, 41, 8, 17, 22, 28, 5, 44, 2

Offset

1,2

Links

T. D. Noe, Table of n, a(n) for n = 1..1000

Mathematica

Table[Length[Union[PowerMod[10, Range[0, n], n]]], {n, 100}] - T. D. Noe, Aug 30 2006

Crossrefs

Cf. A121341.

Sequence in context: A365383 A144154 A350768 * A331779 A243556 A048233

Adjacent sequences: A054707 A054708 A054709 * A054711 A054712 A054713

Keyword

easy,nonn

Author

Henry Bottomley, Apr 20 2000

Status

approved