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 A110872 #11 Oct 12 2019 11:58:28 %S A110872 3,7,9,15,17,23,25,33,39,41,47,55,71,81,87,89,95,103,113,121,127,129, %T A110872 137,143,151,153,169,177,191,193,199,201,215,223,225,263,265,271,281, %U A110872 297,319,327,335,337,345,351,359,369,375,401,407,415,417,423,439,447 %N A110872 Numbers n such that (n^2+7)/8 is prime. %H A110872 G. C. Greubel, <a href="/A110872/b110872.txt">Table of n, a(n) for n = 1..5000</a> %F A110872 a(n) = 2*A067186(n) + 1 = Sqrt(A110873(n)). %t A110872 Select[Range[300], PrimeQ[(#^2 + 7)/8] &] (* _Ray Chandler_, Oct 08 2005 *) %o A110872 (PARI) is(n)=isprime((n^2+7)/8) \\ _Charles R Greathouse IV_, May 22 2017 %Y A110872 Cf. A055469, A067186, A110873. %K A110872 nonn %O A110872 1,1 %A A110872 _Giovanni Teofilatto_, Sep 18 2005 %E A110872 Extended by _Ray Chandler_, Oct 08 2005