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 A250185 #12 Sep 08 2022 08:46:10 %S A250185 2,7,13,17,19,41,48,58,59,66,86,129,133,139,143,146,149,166,167,231, %T A250185 268,270,299,328,359,387,397,408,469,523,527,534,541,553,555,569,582, %U A250185 583,600,608,634,664,667,672,673,709,714,720,725,733,746,759,776,802,808,822,860,870,877,892,896,902,911,962,970,975,1034,1050,1051,1082 %N A250185 Numbers n such that Phi(34,n) is prime, where Phi is the cyclotomic polynomial. %H A250185 G. C. Greubel, <a href="/A250185/b250185.txt">Table of n, a(n) for n = 1..10000</a> %t A250185 Select[Range[2000], PrimeQ[(#^17 + 1) / (# + 1)] &] (* _Vincenzo Librandi_, Jan 15 2015 *) %o A250185 (Magma) [n: n in [1..2000]| IsPrime((n^17+1) div (n+1))]; // _Vincenzo Librandi_, Jan 15 2015 %o A250185 (PARI) is(n)=isprime(polcyclo(34,n)) \\ _Charles R Greathouse IV_, Sep 08 2015 %Y A250185 Cf. A246392. %K A250185 nonn %O A250185 1,1 %A A250185 _R. J. Mathar_, Jan 12 2015