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 A138919 Indices k such that A020510(k)=Phi[k](-11) is prime, where Phi is a cyclotomic polynomial. 3
 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, 1220, 1272, 1568, 1688, 1696, 1710, 1814, 2136, 2262, 2288, 2862, 3679, 3814, 4058, 4304, 4480, 5070, 5136, 5154 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Larger values are probable primes. LINKS Robert Price, Table of n, a(n) for n = 1..91 Yves Gallot, Cyclotomic polynomials and prime numbers Index entries for cyclotomic polynomials, values at X MATHEMATICA Select[Range[1000], PrimeQ[Cyclotomic[#, -11]] &] PROG (PARI) for( i=1, 999, ispseudoprime( polcyclo(i, -11)) & print1(", ", i)) /* use ...subst(polcyclo(i), x, -11)... in PARI < 2.4.2 */ CROSSREFS Cf. A020510, A138920-A138940, A070518-A070527. Sequence in context: A271656 A145582 A034762 * A345909 A214414 A153192 Adjacent sequences: A138916 A138917 A138918 * A138920 A138921 A138922 KEYWORD nonn AUTHOR M. F. Hasler, Apr 04 2008 EXTENSIONS Edited by T. D. Noe, Oct 30 2008 a(32)-a(44) from Robert Price, Mar 16 2012 a(45)-a(50) from Robert Price, Apr 14 2012 STATUS approved

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Last modified April 14 09:38 EDT 2024. Contains 371657 sequences. (Running on oeis4.)