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Search: id:A007615
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| A007615 |
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Primes with unique period length (the periods are given in A007498).
(Formerly M2890)
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+0
5
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| 3, 11, 37, 101, 333667, 9091, 9901, 909091, 1111111111111111111, 11111111111111111111111, 99990001, 999999000001, 909090909090909091, 900900900900990990990991, 9999999900000001
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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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.
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..25
Index entries for sequences related to decimal expansion of 1/n
C. K. Caldwell, The Prime Glossary, unique prime
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EXAMPLE
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3 is the only prime p such that decimal expansion of 1/p has (nontrivial) period exactly 1.
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CROSSREFS
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Cf. A007498, A040017, A002371, A048595, A006883, A007732, A051626.
Sequence in context: A061075 A005422 A040017 this_sequence A065540 A084171 A118044
Adjacent sequences: A007612 A007613 A007614 this_sequence A007616 A007617 A007618
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KEYWORD
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nonn,nice,easy,base
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Robert G. Wilson v (rgwv(AT)rgwv.com), Mira Bernstein (mira(AT)math.berkeley.edu)
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