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 A138933 Indices k such that A019321(k)=Phi[k](3) is prime, where Phi is a cyclotomic polynomial. 4
 1, 3, 6, 7, 9, 10, 12, 13, 14, 15, 21, 24, 26, 33, 36, 40, 46, 60, 63, 70, 71, 72, 86, 103, 108, 130, 132, 143, 145, 154, 161, 236, 255, 261, 276, 279, 287, 304, 364, 430, 464, 513, 528, 541, 562, 665, 672, 680, 707, 718, 747, 760, 782, 828, 875, 892, 974, 984 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Robert Price, Table of n, a(n) for n = 1..167 Yves Gallot, Cyclotomic polynomials and prime numbers Index entries for cyclotomic polynomials, values at X MATHEMATICA Select[Range[1000], PrimeQ[Cyclotomic[#, 3]] &] PROG (PARI) for( i=1, 999, ispseudoprime( polcyclo(i, 3)) &&& print1( i", ")) /* use ...subst(polcyclo(i), x, 3)... in PARI < 2.4.2 */ CROSSREFS Cf. A019321, A072226, A138920-A138940. Sequence in context: A190189 A129414 A157319 * A288938 A282140 A071530 Adjacent sequences: A138930 A138931 A138932 * A138934 A138935 A138936 KEYWORD nonn AUTHOR M. F. Hasler, Apr 03 2008 STATUS approved

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Last modified September 30 06:20 EDT 2023. Contains 365781 sequences. (Running on oeis4.)