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 A075519 #14 Sep 08 2022 08:45:07 %S A075519 11,13,23,29,31,47,53,71,79,127,149,151,167,173,191,239,269,271,293, %T A075519 317,359,389,431,439,509,557,599,607,631,653,719,727,773,797,911,919, %U A075519 967,1031,1087,1109 %N A075519 Primes p such that floor(p/4) is prime. %H A075519 Vincenzo Librandi, <a href="/A075519/b075519.txt">Table of n, a(n) for n = 1..1000</a> %e A075519 23 is a term, as 23 = 4*5 + 3. %t A075519 Select[Prime[Range[6! ]],PrimeQ[Floor[ #/4]]&] (* _Vladimir Joseph Stephan Orlovsky_, Nov 25 2009 *) %o A075519 (Magma) [p: p in PrimesUpTo(2000)| IsPrime(Floor(p/4))]; // _Vincenzo Librandi_, Aug 04 2013 %Y A075519 Cf. A075518, A075521. %K A075519 nonn %O A075519 1,1 %A A075519 _Reinhard Zumkeller_, Sep 19 2002 %E A075519 Definition corrected by _Eric M. Schmidt_, Aug 04 2013