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 A153781 #14 Sep 08 2022 08:45:40 %S A153781 0,1,2,3,5,6,7,8,14,15,16,19,20,24,27,28,34,36,37,40,41,42,44,45,47, %T A153781 49,57,59,62,64,66,68,71,72,73,78,84,85,86,90,96,103,105,106,110,117, %U A153781 119,122,124,129,132,133,136,141,150,154,156,157,163,168,169,174 %N A153781 Numbers n such that n^2+13n+23 is prime. %H A153781 Vincenzo Librandi, <a href="/A153781/b153781.txt">Table of n, a(n) for n = 1..1000</a> %t A153781 Select[Range[0,900], PrimeQ[#^2 + 13 # + 23] &] (* _Vincenzo Librandi_, Jul 31 2012 *) %o A153781 (Magma) [n: n in [0..200]| IsPrime(n^2+13*n+23)]; // _Vincenzo Librandi_, Jul 31 2012 %o A153781 (PARI) is(n)=isprime(n^2+13*n+23) \\ _Charles R Greathouse IV_, May 22 2017 %Y A153781 Cf. A144561. %K A153781 nonn,easy %O A153781 1,3 %A A153781 _Vincenzo Librandi_, Jan 03 2009