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A138936 Indices n such that A019324(k)=Phi[k](6) is prime, where Phi is a cyclotomic polynomial. 3
1, 2, 3, 4, 6, 7, 8, 18, 21, 22, 24, 29, 30, 42, 50, 62, 71, 86, 90, 94, 118, 124, 127, 144, 154, 192, 214, 271, 354, 360, 411, 480, 509, 558, 575, 663, 764, 814, 825, 874, 1028, 1049, 1050, 1102, 1113, 1131, 1158, 1376, 1464, 1468, 1535, 1622, 1782, 1834 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Robert Price, Table of n, a(n) for n = 1..103

Yves Gallot, Cyclotomic polynomials and prime numbers

Index entries for cyclotomic polynomials, values at X

MATHEMATICA

Select[Range[1000], PrimeQ[Cyclotomic[#, 6]] &]

PROG

(PARI) for( i=1, 999, ispseudoprime( polcyclo(i, 6)) && print1( i", ")) /* use ...subst(polcyclo(i), x, 6)... in PARI < 2.4.2 */

CROSSREFS

Cf. A019324, A138920-A138940.

Sequence in context: A039087 A093710 A091421 * A135604 A084826 A118944

Adjacent sequences:  A138933 A138934 A138935 * A138937 A138938 A138939

KEYWORD

nonn

AUTHOR

M. F. Hasler, Apr 03 2008

EXTENSIONS

a(41)-a(54) from Robert Price, Apr 16 2012

STATUS

approved

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Last modified June 16 14:38 EDT 2019. Contains 324152 sequences. (Running on oeis4.)