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 A155703 #17 Jun 30 2025 14:15:45 %S A155703 3,7,13,19,31,43,97,127,223,241,271,283,307,397,421,439,577,601,619, %T A155703 661,673,691,727,853,859,967,1009,1051,1063,1123,1153,1237,1321,1429, %U A155703 1447,1543,1567,1597,1609,1657,1669,1861,1867,1933,1951,1987,2017,2089,2203 %N A155703 Primes p such that 2*p^2 + 16*p + 23 is also prime. %H A155703 Vincenzo Librandi, <a href="/A155703/b155703.txt">Table of n, a(n) for n = 1..1000</a> %t A155703 Select[Prime[Range[2500]], PrimeQ[(2*#^2 + 16*# + 23)]&] (* _Vincenzo Librandi_, Oct 30 2012 *) %o A155703 (Magma) [p: p in PrimesUpTo(3000)|IsPrime(2*p^2+16*p+23)]; %Y A155703 Cf. A155702, A153037. %K A155703 nonn,easy %O A155703 1,1 %A A155703 _Vincenzo Librandi_, Jan 25 2009 %E A155703 Entries confirmed by _John W. Layman_, Jun 17 2010