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 A111496 #5 Feb 01 2017 09:12:14 %S A111496 444,644,664,666,966,996,999,4444,4466,4494,4696,4964,6644,6666,6699, %T A111496 9444,9496,9646,9964,9966,9999,44444,44499,44646,44996,46444,46449, %U A111496 46964,46996,49444,49494,49946,49966,49996,64446,64494,64644,64666 %N A111496 4-almost primes with semiprime digits (digits 4, 6, 9 only). %H A111496 Charles R Greathouse IV, <a href="/A111496/b111496.txt">Table of n, a(n) for n = 1..10000</a> %e A111496 a(1) = 444 = 2^2 * 3 * 37, a(2) = 644 = 2^2 * 7 * 23, a(3) = 664 = 2^3 * 83, a(4) = 666 = 2 * 3^2 * 37, a(5) = 966 = 2 * 3 * 7 * 23, a(6) = 996 = 2^2 * 3 * 83, a(7) = 999 = 3^3 * 37, a(8) = 4466 = 2 * 7 * 11 * 29, a(9) = 4494 = 2 * 3 * 7 * 107, a(10) = 4696 = 2^3 * 587. %o A111496 (PARI) do(N)=my(v=List(), a=[4, 6, 9]); for(d=1, N, forvec(u=vector(d, i, [1, 3]), t=fromdigits(apply(n->a[n], u)); if(bigomega(t)==4, listput(v, t)))); Set(v) \\ _Charles R Greathouse IV_, Feb 01 2017 %Y A111496 Cf. A001358, A014613, A107665, A107666, A107342, A111494, A111697. %K A111496 base,easy,nonn %O A111496 1,1 %A A111496 _Jonathan Vos Post_, Nov 16 2005