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A138923
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Indices k such that A020506(k)=Phi[k](-7) is prime, where Phi is a cyclotomic polynomial.
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0
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3, 9, 10, 15, 17, 23, 25, 26, 27, 28, 29, 36, 42, 47, 48, 61, 76, 84, 110, 126, 148, 210, 224, 262, 280, 288, 296, 298, 325, 327, 332, 352, 365, 456, 513, 528, 740
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| There are only 6 terms between 365 and 1445 (exclusive).
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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, -7)) & print1( i", ")) /* use ...subst(polcyclo(i), x, -7)... in PARI < 2.4.2 */
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CROSSREFS
| Cf. A020506, A138920-A138940.
Sequence in context: A030608 A118515 A191339 * A049096 A030794 A134073
Adjacent sequences: A138920 A138921 A138922 * A138924 A138925 A138926
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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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