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 A106146 #9 Mar 23 2014 10:38:21 %S A106146 4,6,9,0,4,5,1,2,5,6,3,4,5,8,9,6,9,1,5,7,8,2,5,9,4,7,2,5,6,7,1,3,4,5, %T A106146 6,1,5,8,9,1,2,3,9,3,4,1,2,3,5,6,5,8,9,1,6,9,7,8,3,5,7,4,1,2,3,5,6,9, %U A106146 3,4,5,7,8,9,1,6,5,7,7,9,3,4,9,2,5,7,4,8,7,9,1,5,8,9,1,2,3,5,9,4,9,1,3,6,7 %N A106146 Semiprimes (mod 10). %H A106146 Reinhard Zumkeller, <a href="/A106146/b106146.txt">Table of n, a(n) for n = 1..10000</a> %t A106146 Mod[#,10]&/@Select[Range[500],PrimeOmega[#]==2&] (* _Harvey P. Dale_, Apr 04 2013 *) %o A106146 (Haskell) %o A106146 a106146 = flip mod 10 . a001358 -- _Reinhard Zumkeller_, Mar 23 2014 %Y A106146 Cf. A001358. %Y A106146 Cf. A239634 (initial digits). %K A106146 nonn %O A106146 1,1 %A A106146 _Shyam Sunder Gupta_, May 07 2005