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 A078828 #3 Mar 30 2012 18:50:29 %S A078828 1,1,2,3,2,10,6,63,2,2,20,330,6,390,126,1323,2,34,4,114,20,100,660, %T A078828 159390,6,6,780,12870,126,237510,2646,861273,2,2,68,102,4,740,228, %U A078828 2394,20,820,200,141900,660,42900,318780,157317930,6,102,12,342,780,206700 %N A078828 Product of all primes contained as binary substrings in binary representation of n. %e A078828 n=7: product of the A078827(7)=3 primes as binary substrings in binary representation of 7 -> '111': a(7) = '11'*'11'*'111' = 3*3*7 = 63. %Y A078828 Cf. A078827, A078822, A007088. %K A078828 nonn,base %O A078828 0,3 %A A078828 _Reinhard Zumkeller_, Dec 08 2002