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 A155738 #16 Jul 22 2025 06:19:43 %S A155738 2,3,5,13,19,23,43,47,67,79,103,109,149,157,179,193,239,353,373,397, %T A155738 419,487,499,503,523,547,563,569,587,619,677,683,787,797,839,853,863, %U A155738 929,1013,1093,1193,1229,1289,1303,1319,1423,1433,1499,1553,1619,1669,1733 %N A155738 Primes p such that 4*p^2+2*p-1 is also prime. %H A155738 Vincenzo Librandi, <a href="/A155738/b155738.txt">Table of n, a(n) for n = 1..1000</a> %F A155738 A155736 INTERSECT A000040. [_R. J. Mathar_, Jan 05 2011] %t A155738 Select[Prime[Range[400]],PrimeQ[4#^2+2#-1]&] (* _Harvey P. Dale_, Mar 22 2011 *) %o A155738 (Magma) [p: p in PrimesUpTo(1800)| IsPrime(4*p^2 + 2*p - 1)]; // _Vincenzo Librandi_, Oct 30 2012 %Y A155738 Cf. A155736, A155737. %K A155738 nonn,easy %O A155738 1,1 %A A155738 _Vincenzo Librandi_, Jan 26 2009