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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
4
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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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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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njas, Robert G. Wilson v (rgwv(AT)rgwv.com), Mira Bernstein (mira(AT)math.berkeley.edu)
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