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 A329031 #12 Nov 07 2019 14:39:00
%S A329031 0,1,1,5,1,5,1,7,8,31,8,31,1,7,8,31,8,31,1,7,8,31,8,31,1,7,8,31,8,31,
%T A329031 1,9,10,41,10,41,12,59,71,247,71,247,12,59,71,247,71,247,12,59,71,247,
%U A329031 71,247,12,59,71,247,71,247,1,9,10,41,10,41,12,59,71,247,71,247,12,59,71,247,71,247,12,59,71,247,71,247,12,59
%N A329031 a(n) = A327860(A328841(n)).
%H A329031 Antti Karttunen, <a href="/A329031/b329031.txt">Table of n, a(n) for n = 0..32768</a>
%H A329031 <a href="/index/Pri#primorialbase">Index entries for sequences related to primorial base</a>
%F A329031 a(n) = A327860(A328841(n)) = A003415(A276086(A328841(n))).
%F A329031 a(n) = A003415(A328571(n)) = A069359(A328571(n)).
%o A329031 (PARI) A329031(n) = { my(s=0, m=1, p=2); while(n, if(n%p, m *= p; s += (1/p)); n = n\p; p = nextprime(1+p)); (s*m); };
%Y A329031 Cf. A003415, A069359, A276086, A327860, A328571, A328841, A329032.
%Y A329031 Cf. A060735 (the positions of ones).
%K A329031 nonn
%O A329031 0,4
%A A329031 _Antti Karttunen_, Nov 07 2019