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 A139106 #7 Oct 03 2015 23:15:03 %S A139106 10,100101,100101011101,100101011101011101, %T A139106 1001010111010111010111011111,100101011101011101011101111101011111, %U A139106 100101011101011101011101111101011111011101,1001010111010111010111011111010111110111010111011111,100101011101011101011101111101011111011101011101111101111101,1001010111010111010111011111010111110111010111011111011111010111110111,100101011101011101011101111101011111011101011101111101111101011111011101011111,1001010111010111010111011111010111110111010111011111011111010111110111010111110111011111 %N A139106 Bisection of A139101. %F A139106 a(n) = A139101(2n). - _R. J. Mathar_, Apr 25 2008 %p A139106 A139101 := proc(n) option remember ; local a,p; if n = 1 then RETURN(1); else a := 10*A139101(n-1) ; for p from ithprime(n-1)+1 to ithprime(n)-1 do a := 10*a+1 ; od: fi ; RETURN(a) ; end: A139106 := proc(n) A139101(2*n) ; end: seq(A139106(n),n=1..12) ; # _R. J. Mathar_, Apr 25 2008 %Y A139106 Cf. A139101. %K A139106 easy,nonn,base,less %O A139106 1,1 %A A139106 _Omar E. Pol_, Apr 08 2008 %E A139106 More terms from _R. J. Mathar_, Apr 25 2008