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A353756
a(n) = A353752(n) / gcd(A062401(n), A353752(n)), where A062401(n) = phi(sigma(n)), and A353752(n) = Product_{p^e||n} phi(sigma(p^e)).
5
1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 6, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1
OFFSET
1,10
COMMENTS
Denominator of fraction A062401(n) / A353752(n).
FORMULA
a(n) = A353752(n) / A353754(n) = A353752(n) / gcd(A062401(n), A353752(n)).
PROG
(PARI)
A062401(n) = eulerphi(sigma(n));
A353756(n) = { my(f = factor(n), u=prod(k=1, #f~, A062401(f[k, 1]^f[k, 2]))); (u / gcd(A062401(n), u)); };
CROSSREFS
Cf. also A353806.
Sequence in context: A204162 A266227 A043285 * A245690 A146291 A327538
KEYWORD
nonn,frac
AUTHOR
Antti Karttunen, May 08 2022
STATUS
approved