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A138922
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Indices k such that A020507(k)=Phi[k](-8) is prime, where Phi is a cyclotomic polynomial.
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0
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6, 15, 18, 21, 39, 69, 159, 165, 174, 231, 378, 408, 501, 504, 606, 873, 897
(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
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PROG
| (PARI) for( i=1, 999, ispseudoprime( polcyclo(i, -8)) & print1( i", ")) /* use ...subst(polcyclo(i), x, -8)... in PARI < 2.4.2 */
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CROSSREFS
| Cf. A020507, A138920-A138940.
Sequence in context: A070999 A128693 A105285 * A044058 A105139 A002599
Adjacent sequences: A138919 A138920 A138921 * A138923 A138924 A138925
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KEYWORD
| nonn,more
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AUTHOR
| M. F. Hasler (www.univ-ag.fr/~mhasler), Apr 03 2008
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