A345045 a(n) = A047994(n) / A345044(n), where A047994(n) is multiplicative with a(p^e) = p^e - 1, and A345044(n) gives the least common multiple of the same factors.
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 3, 1, 2, 1, 1, 2, 1, 2, 1, 1, 1, 2, 1, 1, 2, 1, 1, 4, 1, 1, 1, 1, 1, 2, 3, 1, 1, 2, 1, 2, 1, 1, 2, 1, 1, 2, 1, 4, 2, 1, 1, 2, 2, 1, 1, 1, 1, 2, 3, 2, 2, 1, 1, 1, 1, 1, 6, 4, 1, 2, 1, 1, 4, 6, 1, 2, 1, 2, 1, 1, 1, 2, 3, 1, 2, 1, 1, 4
Offset: 1
Keywords
Links
- Antti Karttunen, Table of n, a(n) for n = 1..65537
Programs
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PARI
A345045(n) = { my(f=factor(n)~, g=vector(#f, i, (f[1, i]^f[2, i])-1)); factorback(g)/lcm(g); };