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A138937
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Indices k such that A019325(k)=Phi[k](7) is prime, where Phi is a cyclotomic polynomial.
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0
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5, 6, 13, 18, 21, 28, 30, 34, 36, 46, 48, 50, 54, 55, 58, 63, 76, 84, 94, 105, 122, 131, 148, 149, 224, 280, 288, 296, 332, 352, 456, 528, 531, 581, 650, 654, 730, 740, 759
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| Yves Gallot, Cyclotomic polynomials and prime numbers
Index entries for cyclotomic polynomials, values at X
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PROG
| (PARI) for( i=1, 999, ispseudoprime( polcyclo(i, 7)) & print1( i", ")) /* use ...subst(polcyclo(i), x, 7)... in PARI < 2.4.2 */
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CROSSREFS
| Cf. A019325, A138920-A138940.
Sequence in context: A067245 A059176 A030356 * A099330 A180686 A145491
Adjacent sequences: A138934 A138935 A138936 * A138938 A138939 A138940
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KEYWORD
| nonn
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AUTHOR
| M. F. Hasler (www.univ-ag.fr/~mhasler), Apr 03 2008
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