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 A221867 #20 Apr 20 2013 12:34:38
%S A221867 54,218,222054,669806,155593313228,31860927184920,37843679840313254,
%T A221867 5349233671440437948,65075392901385088766,102744428793110424984,
%U A221867 251471854505406311064463,1074272348712875302655077,1114427338015137279788981
%N A221867 Let m = A153022(n); a(n) = (1 + sum_{i=1..m} prime(i)^2)/(1+m).
%e A221867 For n=2, m=10, a(2) = 2398/11=218.
%Y A221867 Cf. A007504, A045345, A171399, A050247, A050248, A024450, A111441, A217599, A217600, A122140, A223936, A223937, A024525, A153022.
%K A221867 nonn
%O A221867 1,1
%A A221867 _Robert Price_, Apr 10 2013
%E A221867 Definition corrected by _N. J. A. Sloane_, Apr 20 2013