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Search: id:A040017
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| A040017 |
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Unique period primes (no other prime has same period as 1/p) in order (periods are given in A051627). |
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+0
9
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| 3, 11, 37, 101, 9091, 9901, 333667, 909091, 99990001, 999999000001, 9999999900000001, 909090909090909091, 1111111111111111111, 11111111111111111111111, 900900900900990990990991
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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J.-P. Delahaye, Merveilleux nombres premiers ("Amazing primes"), p. 324, Pour la Science Paris 2000.
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LINKS
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C. K. Caldwell, Unique Primes
Index entries for sequences related to decimal expansion of 1/n
Eric Weisstein's World of Mathematics, Unique Prime
Wikipedia, Unique prime
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EXAMPLE
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The decimal expansion of 1/101 is 0.00990099..., having a period of 4, and it is the only prime with that period.
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CROSSREFS
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Cf. A007615 (same numbers ordered by period length)
Cf. A007498, A040017, A002371, A048595, A006883, A007732, A051626, A051627.
Sequence in context: A046107 A061075 A005422 this_sequence A007615 A065540 A084171
Adjacent sequences: A040014 A040015 A040016 this_sequence A040018 A040019 A040020
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KEYWORD
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nonn,base,easy,nice
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AUTHOR
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Jud McCranie j.mccranie(AT)comcast.net
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