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 A078827 #4 Mar 30 2012 18:50:29 %S A078827 0,0,1,1,1,2,2,3,1,1,3,4,2,4,4,5,1,2,2,3,3,4,5,7,2,2,5,6,4,7,6,8,1,1, %T A078827 3,3,2,4,4,5,3,4,5,7,5,7,8,10,2,3,3,4,5,7,7,9,4,4,8,10,6,10,9,11,1,1, %U A078827 2,3,3,4,4,6,2,3,5,6,4,6,6,8,3,4,5,7,5,6,8,10,5,6,8,9,8,11,11,13,2,3,4,4,3 %N A078827 Number of primes contained as binary substrings in binary representation of n, counted with repetitions. %e A078827 n=7 -> '111' contains 3 binary substrings which are primes: '11' (11b), '11' (b11) and '111' itself, therefore a(7)=2. %Y A078827 Cf. A078826, A078822, A007088, A001222, A078828. %K A078827 nonn,base %O A078827 0,6 %A A078827 _Reinhard Zumkeller_, Dec 08 2002