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 A241959 #9 May 06 2014 11:06:47 %S A241959 211,1381,3089,5087,10399,18803,26903,27031,31583,41161,47189,49081, %T A241959 53759,62939,63949,76801,87383,93739,98491,107509,109397,113341, %U A241959 128099,143093,158699,182747,186889,193727,197507,201413,204331,209477,239087,252949,255989,256079 %N A241959 Primes p such that p+2, p+4, p+6, p+8, p+10 are semiprimes. %C A241959 Each term in the sequence is prime p which yields 5 semiprimes in arithmetic progression with common difference of 2. %H A241959 K. D. Bajpai, <a href="/A241959/b241959.txt">Table of n, a(n) for n = 1..500</a> %e A241959 a(1) = 211 is prime: 213, 215, 217, 219 and 221 are semiprimes. %e A241959 a(2) = 1381 is prime: 1383, 1385, 1387, 1389 and 1391 are semiprimes. %p A241959 with(numtheory): A241959:= proc() local p;p:=ithprime(x);if bigomega(p+2)=2 and bigomega(p+4)=2 and bigomega(p+6)=2 and bigomega(p+8)=2 and bigomega(p+10)=2 then RETURN (p); fi; end: seq(A241959 (), x=1..100000); %Y A241959 Cf. A001358, A082919, A092128, A241483. %K A241959 nonn %O A241959 1,1 %A A241959 _K. D. Bajpai_, May 03 2014