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 A319613 #36 Jan 10 2019 18:49:00
%S A319613 6,21,65,133,319,481,731,1007,1403,2059,2449,3293,4141,4601,5311,6943,
%T A319613 8201,9211,10921,12283,13213,15247,16517,19847,22213,24139,25853,
%U A319613 28141,29539,31753,37211,40741,43429,46843,52001,54209,58561,62429,66299,70757,75359
%N A319613 a(n) = prime(n) * prime(2n).
%H A319613 Robert Israel, <a href="/A319613/b319613.txt">Table of n, a(n) for n = 1..10000</a>
%p A319613 a:= n-> (p-> p(n)*p(2*n))(ithprime):
%p A319613 seq(a(n), n=1..50); # _Alois P. Heinz_, Jan 08 2019
%t A319613 Table[Prime[n]*Prime[2*n],{n,50}]
%o A319613 (PARI) a(n) = prime(n)*prime(2*n) \\ _Felix Fröhlich_, Jan 09 2019
%Y A319613 Cf. A000040, A001358, A018819, A031215, A031368, A056239, A087897, A101417, A112798, A120641, A320340, A323092, A323093, A323094.
%K A319613 nonn
%O A319613 1,1
%A A319613 _Gus Wiseman_, Jan 07 2019