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 A228727 #18 Sep 04 2013 15:54:05
%S A228727 7,13,23,131,179,229,283,337,107,641,317,163,643,193,1949,523,257,
%T A228727 2053,1021,1933,2477,773,811,401,929,6379,457,6197,5701,1747,547,1949,
%U A228727 1291,2083,647,661,2341,709,1579,2549,2633,1721,4909,2851,857,877,5441,4441
%N A228727 Smallest prime of the form k*prime(n) + prime(k*n).
%C A228727 Primes of the form 2*prime(n) + prime(2*n): 7, 13, 23, 107, 163, 193, 257, 401, 457, 547, 647, 661, 709, 857, 877, 1201,...
%e A228727 a(1)=7 because 7 is prime and 2*prime(1) + prime(2*1) = 4 + 3 = 7.
%e A228727 a(2) = 13 because 13 is prime and 2*prime(2) + prime(2*2) = 6 + 7 = 13.
%t A228727 Table[k = 1; While[p = k*Prime[n] + Prime[k*n]; ! PrimeQ[p], k++]; p, {n, 100}] (* _T. D. Noe_, Sep 03 2013 *)
%Y A228727 Cf. A095304.
%K A228727 nonn
%O A228727 1,1
%A A228727 _Irina Gerasimova_, Aug 31 2013, Sep 04 2013
%E A228727 Corrected by _R. J. Mathar_, Sep 02 2013