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 A250196 Numbers n such that Phi(50,n) is prime, where Phi is the cyclotomic polynomial. 2
 6, 7, 17, 42, 56, 62, 106, 108, 112, 141, 161, 163, 173, 210, 212, 231, 296, 306, 342, 360, 382, 395, 400, 416, 418, 431, 435, 457, 458, 492, 517, 530, 531, 540, 551, 618, 637, 672, 697, 713, 722, 732, 790, 791, 810, 850, 852, 876, 898, 902, 926, 928, 937, 938, 970, 1010, 1091, 1118, 1123, 1150, 1157, 1165 (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[1200], PrimeQ[Cyclotomic[50, #]] &] (* Vincenzo Librandi, Jan 16 2015 *) PROG (PARI) {is(n)=isprime(polcyclo(50, n))}; for(n=1, 1000, if(is(n), print1(n, ", "))) \\ G. C. Greubel, May 20 2018 CROSSREFS Cf. A246392. Sequence in context: A062850 A139450 A219853 * A260563 A118666 A315847 Adjacent sequences:  A250193 A250194 A250195 * A250197 A250198 A250199 KEYWORD nonn AUTHOR R. J. Mathar, Jan 12 2015 STATUS approved

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Last modified September 28 01:27 EDT 2021. Contains 347698 sequences. (Running on oeis4.)