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Search: id:A072859
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| A072859 |
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Primes p for which the period length of 1/p is prime. |
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+0
4
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| 11, 37, 41, 53, 79, 83, 107, 173, 227, 239, 271, 317, 347, 359, 467, 479, 563, 587, 643, 719, 733, 773, 797, 839, 907, 1031, 1187, 1231, 1283, 1307, 1319, 1439, 1493, 1523, 1627, 1637, 1879, 1907, 1987, 2027, 2039, 2467, 2477, 2677, 2791, 2837, 2879, 2963
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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1/37== 0.027027...wiht period length = 3, hence 37 is in the sequence.
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PROGRAM
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(PARI) ? a(n)=if(n<4, n==2, znorder(Mod(10, prime(n)))) ? for(n=1, 100, if(isprime(a(n))==1, print1(prime(n), ", ")))
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CROSSREFS
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Cf. A002371.
Sequence in context: A004637 A052526 A054293 this_sequence A125744 A116057 A099227
Adjacent sequences: A072856 A072857 A072858 this_sequence A072860 A072861 A072862
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KEYWORD
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base,easy,nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), Jul 26 2002
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