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 A090419 #10 Jul 13 2013 12:03:10 %S A090419 1,4,6,8,9,12,16,18,20,24,25,26,27,28,32,33,34,35,36,38,39,40,44,48, %T A090419 49,50,51,52,56,57,60,64,65,66,68,69,72,74,75,76,77,80,82,84,88,92,96, %U A090419 98,99,100,102,104,105,106,108,110,112,114,116,120,121,124 %N A090419 Numbers that cannot be written in binary representation as concatenation of primes. %C A090419 A090418(a(n)) = 0; complement of A090421. %H A090419 Reinhard Zumkeller, <a href="/A090419/b090419.txt">Table of n, a(n) for n = 1..10000</a> %o A090419 (Haskell) %o A090419 a090419 n = a090419_list !! (n-1) %o A090419 a090419_list = filter ((== 0) . a090418) [1..] %o A090419 -- _Reinhard Zumkeller_, Aug 06 2012 %Y A090419 Cf. A004676, A007088. %K A090419 nonn,base %O A090419 1,2 %A A090419 _Reinhard Zumkeller_, Nov 30 2003 %E A090419 Based on corrections in A090418, data recomputed by _Reinhard Zumkeller_, Aug 06 2012