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 A175461 #9 Apr 29 2015 17:13:03
%S A175461 21,69,77,85,93,133,141,205,213,221,237,253,301,309,341,365,381,413,
%T A175461 437,445,453,469,485,493,501,517,533,565,573,581,589,597,629,669,685,
%U A175461 717,749,781,789,813,869,893,901,917,933,949,965,973,989,1037,1077,1101
%N A175461 Semiprimes of form 8n+5.
%C A175461 There are no squares of form 8n+5.
%H A175461 Harvey P. Dale, <a href="/A175461/b175461.txt">Table of n, a(n) for n = 1..1000</a>
%t A175461 Select[8*Range[200]+5,PrimeOmega[#]==2&] (* _Harvey P. Dale_, Apr 29 2015 *)
%o A175461 (PARI) lista(nn) = {vec = vector(nn, i, 8*i+5); smp = select(i->(bigomega(i) == 2), vec); print(smp);} \\ _Michel Marcus_, Oct 15 2013
%Y A175461 Cf. A001358 Semiprimes: products of two primes, A004770 Numbers of form 8n+5, A007521 Primes of form 8n+5, A175462 Number of divisors of integers of form 8n+5, A175463 Numbers n such that 8*n+5 is semiprime.
%K A175461 nonn
%O A175461 1,1
%A A175461 _Zak Seidov_, May 23 2010