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 A038881 #22 Jul 08 2025 22:26:04 %S A038881 5,7,11,19,37,43,53,79,83,89,97,107,113,127,131,137,139,151,157,167, %T A038881 181,211,227,229,239,257,263,269,271,283,307,313,317,347,353,359,389, %U A038881 397,401,421,431,433,439,449,479,491,503,509,521,523,547,563,571,577 %N A038881 Odd primes p such that 11 is a square mod p. %C A038881 Also, only entries p=1 (mod 4) of the sequence are squares mod 11 (from the quadratic reciprocity law). - _Lekraj Beedassy_, Jul 21 2004 %H A038881 Zak Seidov, <a href="/A038881/b038881.txt">Table of n, a(n) for n = 1..10000</a> %t A038881 Select[Prime[Range[120]],! JacobiSymbol[11, #]== -1 &] (* _Vincenzo Librandi_, Sep 10 2012 *) %o A038881 (PARI) forprime(p=2,1000,if(kronecker(11,p)==+1,print1(p,", "))) /* _Joerg Arndt_, Apr 24 2011 */ %o A038881 (Magma) [p: p in PrimesInInterval(3,577) | not JacobiSymbol(11,p) eq -1]; // _Bruno Berselli_, Sep 10 2012 %Y A038881 Cf. A038882. %K A038881 nonn,easy %O A038881 1,1 %A A038881 _N. J. A. Sloane_ %E A038881 Added "odd" to definition (otherwise 2 would be a term). - _N. J. A. Sloane_, Jul 04 2023