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 A008866 #10 Mar 28 2014 02:16:32 %S A008866 1,8,2,18,2,30,2,42,6,60,6,78,2,90,6,112,2,128,4,144,6,162,6,186,4, %T A008866 204,4,216,4,240,4,268,2,288,2,308,6,330,6,352,2,372,2,390,2,410,12, %U A008866 450,2,462,6,480,10,508,6,532 %N A008866 Prime(A052928(n+1)) + (-1)^n* prime(A109613(n)). %D A008866 Problem #1210, Series Formation, by Charles W. Trigg, J. Rec. Math., 15 (1982), 221-222. %p A008866 ithprime(2*ceil(n/2))+(-1)^n*ithprime(2*floor(n/2)+1); %K A008866 nonn %O A008866 1,2 %A A008866 _N. J. A. Sloane_, _R. K. Guy_