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A336551
a(n) = A003557(n) - 1.
5
0, 0, 0, 1, 0, 0, 0, 3, 2, 0, 0, 1, 0, 0, 0, 7, 0, 2, 0, 1, 0, 0, 0, 3, 4, 0, 8, 1, 0, 0, 0, 15, 0, 0, 0, 5, 0, 0, 0, 3, 0, 0, 0, 1, 2, 0, 0, 7, 6, 4, 0, 1, 0, 8, 0, 3, 0, 0, 0, 1, 0, 0, 2, 31, 0, 0, 0, 1, 0, 0, 0, 11, 0, 0, 4, 1, 0, 0, 0, 7, 26, 0, 0, 1, 0, 0, 0, 3, 0, 2, 0, 1, 0, 0, 0, 15, 0, 6, 2, 9, 0, 0, 0, 3, 0
OFFSET
1,8
LINKS
FORMULA
a(n) = A066503(n) / A007947(n).
PROG
(PARI) A336551(n) = { my(f=factor(n)); for(i=1, #f~, f[i, 2] = f[i, 2]-1); (factorback(f)-1); };
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jul 28 2020
STATUS
approved