A175174 Least primitive number k such that 1/k is in the Cantor set and the fraction 1/k has period n in base 3.

1, 4, 13, 10, 121, 28, 1093, 82, 757, 244, 88573, 730, 797161, 2188, 59293, 6562, 64570081, 1036, 581130733, 2362, 4785157, 177148, 47071589413, 84253, 3501192601, 1594324, 387440173, 4782970, 34315188682441, 66124

Offset

1,2

Comments

Primitive means that 3 does not divide k. The term a(n) is the first term in row n of A173800. For n=p^k, with p prime and k>0, it appears that a(n) = Phi(n,3), the n-th cyclotomic polynomial evaluated at 3.

Links

T. D. Noe, Table of n, a(n) for n=1..200

Crossrefs

Sequence in context: A101181 A160249 A173800 * A369412 A136137 A287895

Adjacent sequences: A175171 A175172 A175173 * A175175 A175176 A175177

Keyword

nonn

Author

T. D. Noe, Feb 28 2010

Status

approved