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Search: id:A138934
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| A138934 |
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Indices k such that A019322(k)=Phi[k](4) is prime, where Phi is a cyclotomic polynomial. |
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1
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| 1, 2, 4, 6, 8, 12, 16, 20, 28, 40, 60, 92, 96, 104, 140, 148, 156, 300, 356, 408, 596, 612, 692, 732, 756, 800, 952, 996
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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It appears that except for 1,2 and 6, all terms of this sequence are multiplies of 4.
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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, 4)) && print1( i", ")) /* use ...subst(polcyclo(i), x, 4)... in PARI < 2.4.2 */
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CROSSREFS
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Cf. A019322, A072226, A138920-A138940.
Sequence in context: A097921 A117146 A061553 this_sequence A008764 A065386 A048951
Adjacent sequences: A138931 A138932 A138933 this_sequence A138935 A138936 A138937
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KEYWORD
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nonn,more
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AUTHOR
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M. F. Hasler (www.univ-ag.fr/~mhasler), Apr 03 2008
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