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 A191023 #17 Sep 08 2022 08:45:57 %S A191023 11,13,17,23,29,31,37,43,47,59,67,79,101,113,131,137,149,151,157,163, %T A191023 167,179,199,233,241,251,257,263,269,271,277,283,307,353,373,383,389, %U A191023 397,409,419,439,461,491,503,509,523,547,593,601,613,617,631,643,647 %N A191023 Primes p which have Kronecker symbol (p|30) = 1. %C A191023 Originally incorrectly named "primes which are squares (mod 30)", which is sequence A033212. - M. F. Hasler, Jan 15 2016 %H A191023 Vincenzo Librandi, <a href="/A191023/b191023.txt">Table of n, a(n) for n = 1..1000</a> %t A191023 Select[Prime[Range[200]], JacobiSymbol[#,30]==1&] %o A191023 (Magma) [p: p in PrimesUpTo(647) | KroneckerSymbol(p, 30) eq 1]; // _Vincenzo Librandi_, Sep 11 2012 %o A191023 (PARI) is(n)=isprime(n) && kronecker(n,30)==1 \\ _Charles R Greathouse IV_, Jul 12 2016 %Y A191023 Cf. A191017, A191018, A191020. %K A191023 nonn,easy %O A191023 1,1 %A A191023 _T. D. Noe_, May 24 2011 %E A191023 Definition corrected (following an observation by _David Broadhurst_) by _M. F. Hasler_, Jan 15 2016