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Search: id:A138940
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| A138940 |
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Indices n such that A019328(n)=Phi[n](10) is prime, where Phi is a cyclotomic polynomial. |
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20
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| 2, 4, 10, 12, 14, 19, 23, 24, 36, 38, 39, 48, 62, 93, 106, 120, 134, 150, 196, 317, 320, 385, 586, 597, 654, 738, 945
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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"Unique [period] primes" (A040017) are often of the form Phi[k](10) or Phi[k](-10).
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LINKS
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C. Caldwell, Unique Primes.
Index entries for cyclotomic polynomials, values at X
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PROGRAM
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(PARI) for( i=1, 999, isprime( polcyclo(i, 10)) && print1( i", ")) /* for PARI < 2.4.2 use ...subst(polcyclo(i, x), x, 10)... */
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CROSSREFS
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Cf. A019328, A040017.
Sequence in context: A136818 A029984 A101519 this_sequence A129412 A113536 A081887
Adjacent sequences: A138937 A138938 A138939 this_sequence A138941 A138942 A138943
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KEYWORD
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nonn,more
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AUTHOR
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M. F. Hasler (www.univ-ag.fr/~mhasler), Apr 03 2008
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