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Search: id:A138919
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| A138919 |
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Indices k such that A020510(k)=Phi[k](-11) is prime, where Phi is a cyclotomic polynomial. |
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1
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| 5, 7, 18, 20, 21, 30, 34, 36, 38, 52, 54, 60, 90, 104, 117, 123, 146, 159, 179, 182, 229, 278, 388, 405, 410, 439, 552, 557, 735, 806, 807
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Larger values are strong pseudoprimes, primality not yet proved.
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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, -11)) & print1(", ", i)) /* use ...subst(polcyclo(i), x, -11)... in PARI < 2.4.2 */
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CROSSREFS
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Cf. A020510, A138920-A138940, A070518-A070527.
Sequence in context: A101580 A123195 A034762 this_sequence A028319 A116640 A116623
Adjacent sequences: A138916 A138917 A138918 this_sequence A138920 A138921 A138922
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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 04 2008
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