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A337549
a(n) = A003972(n) - n.
5
0, 0, 1, 2, 1, 2, 3, 10, 11, 2, 1, 12, 3, 6, 9, 38, 1, 22, 3, 16, 19, 2, 5, 48, 17, 6, 73, 32, 1, 18, 5, 130, 15, 2, 25, 84, 3, 6, 25, 68, 1, 38, 3, 28, 75, 10, 5, 168, 61, 34, 21, 44, 5, 146, 17, 124, 31, 2, 1, 84, 5, 10, 137, 422, 31, 30, 3, 40, 43, 50, 1, 288, 5, 6, 93, 56, 43, 50, 3, 244, 419, 2, 5, 156, 23, 6, 33
OFFSET
1,4
COMMENTS
Möbius transform of A286385.
FORMULA
a(n) = A003972(n) - n.
PROG
(PARI)
A003972(n) = { my(f = factor(n)); for (i=1, #f~, f[i, 1] = nextprime(f[i, 1]+1)); eulerphi(factorback(f)); };
A337549(n) = (A003972(n) - n);
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Sep 21 2020
STATUS
approved