A250188 Numbers n such that Phi(39,n) is prime, where Phi is the cyclotomic polynomial.

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

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