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 A250178 Numbers k such that Phi_22(k) is prime, where Phi is the cyclotomic polynomial. 19
 2, 6, 12, 13, 23, 24, 26, 35, 62, 69, 91, 105, 147, 160, 163, 183, 185, 193, 229, 232, 233, 236, 248, 262, 269, 280, 294, 303, 315, 330, 376, 394, 426, 430, 440, 464, 469, 491, 492, 508, 537, 625, 629, 647, 653, 666, 752, 772, 775, 786, 788, 832, 840, 852, 854, 855, 859, 905, 922, 972, 993, 998 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Numbers k such that (k^11+1)/(k+1) is a prime. - Vincenzo Librandi, May 21 2018 LINKS G. C. Greubel, Table of n, a(n) for n = 1..10000 MATHEMATICA a250178[n_] := Select[Range[n], PrimeQ@Cyclotomic[22, #] &]; a250178[1000] (* Michael De Vlieger, Dec 25 2014 *) PROG (PARI) isok(n) = isprime(polcyclo(22, n)); \\ Michel Marcus, Sep 29 2015 (Magma) [n: n in [1..1000]| IsPrime((n^11+1) div (n+1))]; // Vincenzo Librandi, May 21 2018 CROSSREFS See A250177 for references. Sequence in context: A152667 A145892 A216429 * A154712 A079849 A260907 Adjacent sequences: A250175 A250176 A250177 * A250179 A250180 A250181 KEYWORD nonn AUTHOR Eric Chen, Dec 24 2014 STATUS approved

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Last modified March 28 05:31 EDT 2023. Contains 361577 sequences. (Running on oeis4.)