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A250188 Numbers n such that Phi(39,n) is prime, where Phi is the cyclotomic polynomial. 2
10, 23, 86, 240, 254, 284, 340, 369, 371, 378, 382, 407, 422, 448, 459, 574, 582, 613, 619, 667, 686, 703, 767, 769, 844, 851, 875, 881, 944, 987, 995, 1207, 1219, 1233, 1279, 1292, 1343, 1372, 1399, 1409, 1445, 1468, 1497, 1500, 1557, 1586, 1598, 1633, 1645, 1677, 1760, 1807, 1835 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..10000

MATHEMATICA

Select[Range[1900], PrimeQ[Cyclotomic[39, #]] &] (* Vincenzo Librandi, Jan 16 2015 *)

PROG

(PARI) {is(n)=isprime(polcyclo(39, n))};

for(n=1, 1000, if(is(n), print1(n, ", "))) \\ G. C. Greubel, May 20 2018

CROSSREFS

Cf. A246392.

Sequence in context: A219472 A196890 A219383 * A177126 A300150 A187621

Adjacent sequences:  A250185 A250186 A250187 * A250189 A250190 A250191

KEYWORD

nonn

AUTHOR

R. J. Mathar, Jan 12 2015

STATUS

approved

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Last modified September 18 12:35 EDT 2021. Contains 347527 sequences. (Running on oeis4.)