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A250196
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Numbers n such that Phi(50,n) is prime, where Phi is the cyclotomic polynomial.
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2
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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
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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Select[Range[1200], PrimeQ[Cyclotomic[50, #]] &] (* Vincenzo Librandi, Jan 16 2015 *)
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PROG
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(PARI) {is(n)=isprime(polcyclo(50, n))};
for(n=1, 1000, if(is(n), print1(n, ", "))) \\ G. C. Greubel, May 20 2018
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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