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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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0
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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; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Larger values are probable primes.
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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, -11)) & print1(", ", i)) /* use ...subst(polcyclo(i), x, -11)... in PARI < 2.4.2 */
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CROSSREFS
| Cf. A020510, A138920-A138940, A070518-A070527.
Sequence in context: A123195 A145582 A034762 * A153192 A028319 A116640
Adjacent sequences: A138916 A138917 A138918 * A138920 A138921 A138922
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KEYWORD
| nonn
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AUTHOR
| M. F. Hasler (www.univ-ag.fr/~mhasler), Apr 04 2008
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EXTENSIONS
| Edited by T. D. Noe (noe(AT)sspectra.com), Oct 30 2008
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