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A007498 Unique period lengths of primes mentioned in A007615.
(Formerly M0592)
11
1, 2, 3, 4, 9, 10, 12, 14, 19, 23, 24, 36, 38, 39, 48, 62, 93, 106, 120, 134, 150, 196, 294, 317, 320, 385, 586, 597, 654, 738, 945, 1031, 1172, 1282, 1404, 1426, 1452, 1521, 1752, 1812, 1836, 1844, 1862, 2134, 2232, 2264, 2667, 3750, 3903, 3927, 4274, 4354 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

REFERENCES

C. K. Caldwell & H. Dubner, Unique-Period Primes, Table 2 in Journal of Recreational Mathematics 29(1) 46 1998.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Samuel Yates, Period Lengths of Exactly One or Two Prime Numbers, J. Rec. Math., 18 (1985), 22-24.

LINKS

Ray Chandler, Table of n, a(n) for n = 1..106

Chris K. Caldwell, Unique (period) primes and the factorization of cyclotomic polynomials minus one, Mathematica Japonica, 26 (1997), 189-195.

Index entries for sequences related to decimal expansion of 1/n

MATHEMATICA

lst={1}; Do[p=Cyclotomic[n, 10]/GCD[n, Cyclotomic[n, 10]]; If[PrimeQ[p], AppendTo[lst, n]], {n, 3000}]; lst (Noe)

CROSSREFS

Cf. A007615, A002371, A048595, A006883, A007732, A051626.

Sequence in context: A047339 A250483 A084368 * A073338 A200260 A190119

Adjacent sequences:  A007495 A007496 A007497 * A007499 A007500 A007501

KEYWORD

nonn,nice,base

AUTHOR

N. J. A. Sloane, Robert G. Wilson v

EXTENSIONS

More terms from T. D. Noe, Sep 08 2005

a(48)-a(52) from Ray Chandler, Jul 09 2008

STATUS

approved

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Last modified May 24 22:11 EDT 2017. Contains 287008 sequences.