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 A075520 #11 Mar 10 2016 18:35:49 %S A075520 10,15,21,31,47,53,69,79,95,117,127,149,165,175,191,213,239,245,271, %T A075520 287,293,319,335,357,389,405,415,431,437,453,511,527,549,559,597,607, %U A075520 629,655,671,693,719,725,767,773,789,799,847,895,911,917,933,959,965 %N A075520 4*prime(n) + (prime(n) mod 4). %H A075520 Reinhard Zumkeller, <a href="/A075520/b075520.txt">Table of n, a(n) for n = 1..10000</a> %F A075520 a(n) = A001749(n) + A039702(n). %t A075520 4#+Mod[#,4]&/@Prime[Range[60]] (* _Harvey P. Dale_, Mar 10 2016 *) %o A075520 (Haskell) %o A075520 a075520 n = a075520_list !! (n-1) %o A075520 a075520_list = zipWith (+) a001749_list a039702_list %o A075520 -- _Reinhard Zumkeller_, Feb 20 2012 %Y A075520 Cf. A000040, A039702. %K A075520 nonn %O A075520 1,1 %A A075520 _Reinhard Zumkeller_, Sep 19 2002