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A197225 Primes p with the period of the decimal fraction 1/p a prime power, A000961. 2
3, 11, 17, 37, 41, 53, 73, 79, 83, 101, 107, 137, 163, 173, 227, 239, 257, 271, 317, 347, 353, 359, 449, 467, 479, 563, 587, 641, 643, 719, 733, 751, 757, 773, 797, 839, 907, 1031, 1187, 1231, 1283, 1307, 1319, 1409, 1439, 1493, 1523, 1627, 1637, 1879, 1907 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

MATHEMATICA

myPerfectPowerQ[n_] := Length[FactorInteger[n]] == 1; Select[Prime[Range[500]], Mod[10, #] > 0 && myPerfectPowerQ[Length[RealDigits[1/#, 10][[1, 1]]]] &]

CROSSREFS

Cf. A072859 (period is prime).

Cf. A072982 (period is a power of 2).

Cf. A128948 (period is perfect power).

Cf. A197226 (the periods of this sequence).

Cf. A129727 (period is a semiprime).

Sequence in context: A186424 A018520 A154933 * A181507 A154934 A302872

Adjacent sequences:  A197222 A197223 A197224 * A197226 A197227 A197228

KEYWORD

nonn,base

AUTHOR

T. D. Noe, Oct 22 2011

STATUS

approved

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Last modified March 19 13:29 EDT 2019. Contains 321330 sequences. (Running on oeis4.)