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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
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 (list; graph; refs; listen; history; text; internal format)
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 * A136137 A287895 A050223

Adjacent sequences:  A175171 A175172 A175173 * A175175 A175176 A175177

KEYWORD

nonn

AUTHOR

T. D. Noe, Feb 28 2010

STATUS

approved

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Last modified April 21 10:53 EDT 2021. Contains 343150 sequences. (Running on oeis4.)