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Search: id:A138924
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| A138924 |
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Indices k such that A020505(k)=Phi[k](-6) is prime, where Phi is a cyclotomic polynomial. |
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+0
1
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| 3, 4, 6, 8, 9, 11, 14, 15, 21, 24, 25, 31, 42, 43, 45, 47, 58, 59, 77, 107, 124, 142, 144, 177, 192, 254, 279, 360, 407, 437, 480, 525, 542, 551, 579, 764, 811, 822, 891, 917
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Yves Gallot, Cyclotomic polynomials and prime numbers
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PROGRAM
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(PARI) for( i=1, 999, ispseudoprime( polcyclo(i, -6)) & print1( i", ")) /* use ...subst(polcyclo(i), x, -6)... in PARI < 2.4.2 */
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CROSSREFS
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Cf. A020505, A138920-A138940.
Sequence in context: A133280 A138097 A000592 this_sequence A024324 A036446 A059267
Adjacent sequences: A138921 A138922 A138923 this_sequence A138925 A138926 A138927
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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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