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 A074745 #16 Jan 16 2015 05:02:02
%S A074745 6,21,56,133,276,497,820,1257,1924,2823,3970,5487,7250,9271,11762,
%T A074745 14889,18488,22575,27332,32515,38282,44839,52226,60859,70656,81059,
%U A074745 92080,103743,116060,130411,147048,164995,184038,204749,227248,250955
%N A074745 a(n) = sum_{k=1..n} prime(k)*prime(k+1).
%F A074745 a(n) = Sum_{k=1..n} prime(k)*prime(k+1) = Sum_{k=1..n} A006094(k).
%p A074745 with(numtheory): a := proc(n) local k: RETURN(add(ithprime(k)*ithprime(k+1),k=1..n)):end;
%t A074745 s=0;Table[s+=Prime[n]*Prime[n+1],{n,5!}] (* _Vladimir Joseph Stephan Orlovsky_, Nov 19 2010 *)
%o A074745 (PARI) a(n) = sum(k=1, n, prime(k)*prime(k+1)); \\ _Michel Marcus_, Jan 16 2015
%K A074745 nonn
%O A074745 1,1
%A A074745 Antonio G. Astudillo (afg_astudillo(AT)hotmail.com), Sep 06 2002