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 A054273 #5 Oct 15 2013 22:30:49
%S A054273 2,6,10,19,23,29,25,38,42,35,56,54,45,60,67,84,66,76,94,98,95,92,108,
%T A054273 108,107,129,127,128,127,152,160,152,145,173,153,156,183,214,208,212,
%U A054273 201,220,220,219,222,248,255,241,252,265,265,252,280,276,291,292
%N A054273 Number of primes p in the interval prime(n+1) <= p < prime(n+1)^2 such that A002110(n)+p is prime.
%e A054273 n=3, prime(4)=7, prime(4)^2=49; 3rd primorial number = 30; in interval [7,49] 12 primes p occur of which 10 are such that 30+p is prime, namely 30+{7,11,13,17,23,29,31,37,41,43} = {37,41,...,73}, "post-primorial primes", while two primes 19 and 47 yield 49, 77 which are composites. So a(3)=10.
%Y A054273 Cf. A000879, A001248, A000040, A005235, A002110.
%K A054273 nonn
%O A054273 1,1
%A A054273 _Labos Elemer_, May 05 2000