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A295312
a(n) = A062401(n) / A295310(n) = phi(sigma(n)) / gcd(n, phi(sigma(n))).
4
1, 1, 2, 3, 2, 2, 4, 1, 4, 3, 4, 1, 6, 4, 8, 15, 6, 4, 8, 3, 16, 6, 8, 2, 6, 6, 16, 6, 8, 4, 16, 9, 16, 9, 16, 2, 18, 8, 8, 3, 12, 16, 20, 6, 8, 12, 16, 5, 36, 6, 8, 21, 18, 16, 24, 4, 32, 12, 16, 4, 30, 16, 16, 63, 24, 8, 32, 9, 32, 24, 24, 4, 36, 18, 4, 12, 32, 8, 32, 3, 110, 18, 24, 8, 36, 20, 32, 6, 24, 4, 48, 12, 64, 24, 32, 3
OFFSET
1,3
LINKS
FORMULA
a(n) = A000010(A000203(n)) / gcd(n, A000010(A000203(n))).
PROG
(PARI) a(n) = my(fsn = eulerphi(sigma(n))); fsn/gcd(n, fsn); \\ Michel Marcus, Nov 23 2017
KEYWORD
nonn
AUTHOR
Antti Karttunen, Nov 22 2017
STATUS
approved