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 A027757 #29 Sep 08 2022 08:44:49 %S A027757 1,4,13,16,19,25,28,43,49,55,76,79,88,106,118,121,139,145,151,154,175, %T A027757 190,205,208,211,235,238,253,259,268,271,301,310,370,373,376,391,400, %U A027757 403,415,433,445,484,490,508,511,523,544,568,580,583,589,610 %N A027757 Numbers k such that k^2 + k + 9 is prime. %H A027757 Vincenzo Librandi, <a href="/A027757/b027757.txt">Table of n, a(n) for n = 1..10000</a> %H A027757 Patrick De Geest, <a href="http://www.worldofnumbers.com/index.html">World!Of Numbers</a> %t A027757 Select[Range[2500], PrimeQ[#^2 + # + 9] &] (* _Harvey P. Dale_, Dec 01 2010 *) %o A027757 (Magma) [n: n in [0..1000] |IsPrime(n^2+n+9)] // _Vincenzo Librandi_, Nov 20 2010 %o A027757 (PARI) is(n)=isprime(n^2+n+9) \\ _Charles R Greathouse IV_, Feb 20 2017 %K A027757 nonn %O A027757 1,2 %A A027757 _Patrick De Geest_ %E A027757 Additional terms from _Harvey P. Dale_, Dec 01 2010