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 A122500 #18 Aug 03 2025 23:39:24
%S A122500 25,183922,413269,2086561,268550439,77664004259,1286498670037058,
%T A122500 835992504648428541,69918194872608910320341,157104757807495406675035,
%U A122500 353011186440414668176111,13139449230370726052061293111
%N A122500 Semiprimes in A006054.
%t A122500 semiPrimeQ[n_Integer] := Plus @@ Last /@ FactorInteger[n] == 2; s = CoefficientList[ Series[x/(x^3 - x^2 - 2*x + 1), {x, 0, 100}], x]; Select[s, SemiprimeQ@# &]
%t A122500 Select[LinearRecurrence[{2,1,-1},{0,0,1},100],PrimeOmega[#]==2&] (* _Harvey P. Dale_, Aug 21 2013 *)
%Y A122500 Cf. A006054, A006053.
%K A122500 nonn
%O A122500 1,1
%A A122500 _Roger L. Bagula_ and _Gary W. Adamson_, Sep 15 2006
%E A122500 Edited by _N. J. A. Sloane_, Sep 17 2006
%E A122500 More terms from _Robert G. Wilson v_, Sep 18 2006