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 A186303 #17 Jun 08 2022 03:21:14 %S A186303 4,12,16,24,36,40,52,64,76,84,96,100,112,120,132,136,156,180,184,192, %T A186303 216,220,232,240,244,252,300,304,316,324,360,364,372,376,412,420,432, %U A186303 444,456,460,484,492,496,516,520,532,544 %N A186303 a(n) = ( A007522(n)+1 )/2. %H A186303 Amiram Eldar, <a href="/A186303/b186303.txt">Table of n, a(n) for n = 1..10000</a> %F A186303 a(n) = A186302(n)+1. %t A186303 (#+1)/2&/@Select[8*Range[0,300]+7,PrimeQ] (* _Harvey P. Dale_, Jul 14 2011 *) %o A186303 (PARI) is(n)=n%4==0&&isprime(2*n-1) \\ _Charles R Greathouse IV_, Jan 22 2013 %Y A186303 Cf. A007522, A186302. %K A186303 nonn,easy %O A186303 1,1 %A A186303 _Marco Matosic_, Feb 17 2011