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Search: id:A138939
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| A138939 |
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Indices k such that A019327(k)=Phi[k](9) is prime, where Phi is a cyclotomic polynomial. |
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+0
1
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| 6, 12, 18, 20, 30, 36, 54, 66, 118, 138, 152, 182, 232, 264, 336, 340, 380, 414, 446, 492, 540, 624, 720, 762
(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
Index entries for cyclotomic polynomials, values at X
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PROGRAM
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(PARI) for( i=1, 999, ispseudoprime( polcyclo(i, 9)) & print1( i", ")) /* use ...subst( polcyclo(i), x, 9)... in PARI < 2.4.2 */
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CROSSREFS
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Cf. A019327, A138920-A138940.
Sequence in context: A100715 A094519 A088723 this_sequence A105935 A046411 A160594
Adjacent sequences: A138936 A138937 A138938 this_sequence A138940 A138941 A138942
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KEYWORD
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nonn
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AUTHOR
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M. F. Hasler (www.univ-ag.fr/~mhasler), Apr 03 2008
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