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 A064841 #7 Aug 11 2024 14:41:34 %S A064841 1,10,11,1010,101,1011,111,101010,1111,10101,1011,101011,1101,10111, %T A064841 11101,10101010,10001,101111,10011,1010101,11111,101011,10111, %U A064841 10101011,101101,101101,111111,1010111,11101,1011101,11111,1010101010,111011 %N A064841 Working in base 2, replace n with the concatenation of its prime divisors in increasing order. %H A064841 P. De Geest, <a href="https://www.worldofnumbers.com/topic1.htm">Home Primes</a> %e A064841 15 = 3*5 -> 11*101 -> 11101, so a(15) = 11101. %Y A064841 See A048985 for same terms written in base 10. %K A064841 nonn,easy,base %O A064841 1,2 %A A064841 _N. J. A. Sloane_, Oct 31 2001 %E A064841 More terms from Larry Reeves (larryr(AT)acm.org) and _Robert G. Wilson v_, Nov 01 2001