This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A250178 #22 Sep 08 2022 08:46:10 %S A250178 2,6,12,13,23,24,26,35,62,69,91,105,147,160,163,183,185,193,229,232, %T A250178 233,236,248,262,269,280,294,303,315,330,376,394,426,430,440,464,469, %U A250178 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 %N A250178 Numbers k such that Phi_22(k) is prime, where Phi is the cyclotomic polynomial. %C A250178 Numbers k such that (k^11+1)/(k+1) is a prime. - _Vincenzo Librandi_, May 21 2018 %H A250178 G. C. Greubel, <a href="/A250178/b250178.txt">Table of n, a(n) for n = 1..10000</a> %t A250178 a250178[n_] := Select[Range[n], PrimeQ@Cyclotomic[22, #] &]; a250178[1000] (* _Michael De Vlieger_, Dec 25 2014 *) %o A250178 (PARI) isok(n) = isprime(polcyclo(22, n)); \\ _Michel Marcus_, Sep 29 2015 %o A250178 (Magma) [n: n in [1..1000]| IsPrime((n^11+1) div (n+1))]; // _Vincenzo Librandi_, May 21 2018 %Y A250178 See A250177 for references. %K A250178 nonn %O A250178 1,1 %A A250178 _Eric Chen_, Dec 24 2014