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 A090431 #6 Mar 18 2014 04:56:57 %S A090431 -1,-1,-2,-3,3,2,-1,-2,4,-10,-2,-7,-1,-2,-5,-1,-6,2,-3,-6,-7,-12,-6, %T A090431 -11,-9,6,5,2,1,-2,-6,0,-5,-6,-6,2,-3,1,-2,-7,-12,-4,-4,-5,-8,-9,7,5, %U A090431 2,-8,-2,-7,1,1,-4,0,-5,3,-2,-5,-6,-6,-1,5,4,1,6,1,1,-9,-3,-8,-6,-2 %N A090431 Difference between sums of digits of n and n-th prime. %C A090431 a(n) = A007953(n) - A007605(n); %C A090431 a(A033549(n))=a(A049084(A033548(n)))=0; a(A049084(A090432(n)))<0; a(A049084(A090433(n)))>0. %H A090431 Reinhard Zumkeller, <a href="/A090431/b090431.txt">Table of n, a(n) for n = 1..10000</a> %o A090431 (Haskell) %o A090431 a090431 n = a007953 n - a007605 n -- _Reinhard Zumkeller_, Mar 16 2014 %Y A090431 Cf. A239324 (partial sums). %K A090431 sign,base %O A090431 1,3 %A A090431 _Reinhard Zumkeller_, Dec 01 2003