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 A139219 #7 Sep 08 2022 08:45:33
%S A139219 41,47,107,251,317,419,569,821,1031,1217,1367,1637,1811,1871,3527,
%T A139219 5501,5927,6257,6827,8297,8819,9221,10337,14747,17807,20747,21569,
%U A139219 22619,25919,28961,31667,34757,37991,43997,45191,48869,49811,52691,63587
%N A139219 Primes of the form 41+(n+n^2)/2=41+A000217(n).
%C A139219 Corresponding values of n in A139220.
%H A139219 Vincenzo Librandi, <a href="/A139219/b139219.txt">Table of n, a(n) for n = 1..1000</a>
%t A139219 Select[Table[41+(n+n^2)/2,{n,0,800}],PrimeQ]
%o A139219 (Magma) [a: n in [0..500] | IsPrime(a) where a is 41 +(n + n^2) div 2]; // _Vincenzo Librandi_, Mar 22 2013
%Y A139219 Cf. A000217, A056561, A139220, A139221.
%K A139219 nonn,easy
%O A139219 1,1
%A A139219 _Zak Seidov_, Apr 11 2008