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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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS G. C. Greubel, Table of n, a(n) for n = 1..10000 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: A216798 A100372 A084996 * A252078 A342445 A337163 Adjacent sequences:  A250177 A250178 A250179 * A250181 A250182 A250183 KEYWORD nonn AUTHOR Eric Chen, Dec 26 2014 STATUS approved

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Last modified September 24 06:04 EDT 2021. Contains 347623 sequences. (Running on oeis4.)