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 A059900 #9 Oct 18 2022 03:41:40 %S A059900 1,2,3,6,4,8,12,24,5,10,15,30,20,40,60,120,16,32,48,96,64,128,192,384, %T A059900 80,160,240,480,320,640,960,1920,9,18,27,54,36,72,108,216,45,90,135, %U A059900 270,180,360,540,1080,144,288,432,864,576,1152,1728,3456,720,1440,2160 %N A059900 Successively interleaved alternate bits in binary expansion of n gives vector of exponents in prime factorization of a(n). %C A059900 Every value appears once. Inverse of A059884. Similar to A052330 (they diverge at n=16) but assigns bits via interleaving versus numerical order. %H A059900 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %e A059900 To find a(7): 7 = ...000111; ... 0 0 1 1 = 3 -> 2^3 = 8; ... 0 1 = 1 -> 3^1 = 3; so a(7) = 3*8 = 24. %Y A059900 Cf. A059884, A052330. %K A059900 base,easy,nonn %O A059900 0,2 %A A059900 _Marc LeBrun_, Feb 07 2001