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 A075518 #14 Oct 10 2013 16:27:00 %S A075518 0,0,1,1,2,3,4,4,5,7,7,9,10,10,11,13,14,15,16,17,18,19,20,22,24,25,25, %T A075518 26,27,28,31,32,34,34,37,37,39,40,41,43,44,45,47,48,49,49,52,55,56,57, %U A075518 58,59,60,62,64,65,67,67,69,70,70,73,76,77,78,79,82,84,86,87,88,89,91 %N A075518 a(n) = floor(prime(n)/4). %C A075518 a(n)*4 + A039702(n) = A000040(n). %H A075518 Reinhard Zumkeller, <a href="/A075518/b075518.txt">Table of n, a(n) for n = 1..10000</a> %t A075518 Floor[Prime[Range[80]]/4] (* _Harvey P. Dale_, Dec 27 2011 *) %o A075518 (PARI) a(n) = prime(n) \ 4; \\ _Joerg Arndt_, Aug 04 2013 %o A075518 (Haskell) %o A075518 a075518 = (`div` 4) . a000040 -- _Reinhard Zumkeller_, Oct 10 2013 %Y A075518 Cf. A075519. %K A075518 nonn,easy %O A075518 1,5 %A A075518 _Reinhard Zumkeller_, Sep 19 2002