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 A115093 #2 Mar 30 2012 17:22:41 %S A115093 13,19,31,37,53,67,83,89,109,113,127,131,139,157,181,199,211,233,251, %T A115093 257,263,293,307,317,337,353,379,389,401,409,443,449,467,479,487,491, %U A115093 499,503,509,541,557,563,571,577,587,631,647,653,677,683,701,719,743 %N A115093 Primes of the form p*q-2, where p and q are distinct primes. %C A115093 This sequence is a subset of A063637, which is the union of this sequence and A049002. %t A115093 SemiPrimeQ[n_] := (n>1) && (2==Plus@@(Transpose[FactorInteger[n]][[2]])); Select[Prime[Range[150]], SemiPrimeQ[ #+2] && !IntegerQ[Sqrt[ #+2]]&] %Y A115093 Cf. A049002 (primes of the form p^2-2, where p is prime), A063637 (primes of the form p*q-2 where p and q are primes). %K A115093 nonn %O A115093 1,1 %A A115093 _T. D. Noe_, Mar 01 2006