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URL: https://oeis.org/A250180

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A250180
Numbers n such that Phi_25(n) is prime, where Phi is the cyclotomic polynomial.
2
1, 22, 33, 39, 43, 62, 74, 134, 142, 167, 212, 238, 287, 313, 335, 369, 414, 415, 418, 432, 509, 604, 679, 697, 770, 782, 815, 859, 874, 895, 897, 924, 1039, 1048, 1070, 1085, 1134, 1145, 1170, 1177, 1212, 1239, 1240, 1262, 1339, 1347, 1364, 1374, 1407, 1413, 1414, 1449
OFFSET
1,2
LINKS
MATHEMATICA
a250180[n_] := Select[Range[n], PrimeQ@Cyclotomic[25, #] &]; a250180[256]
PROG
(PARI) isok(n) = isprime(polcyclo(25, n)); \\ Michel Marcus, Dec 27 2014
CROSSREFS
See A250177 for references.
Sequence in context: A100372 A390771 A084996 * A252078 A342445 A337163
KEYWORD
nonn
AUTHOR
Eric Chen, Dec 26 2014
STATUS
approved