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A138938
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Indices k such that A019326(k)=Phi[k](8) is prime, where Phi is a cyclotomic polynomial.
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0
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1, 3, 9, 30, 42, 78, 87, 138, 189, 303, 318, 330, 408, 462, 504, 561
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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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, 8)) & print1( i", ")) /* use ...subst( polcyclo(i), x, 8)... in PARI < 2.4.2 */
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CROSSREFS
| Cf. A019326, A138920-A138940.
Sequence in context: A151032 A007472 A151451 * A154147 A179545 A163129
Adjacent sequences: A138935 A138936 A138937 * A138939 A138940 A138941
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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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