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A295314
a(n) = sigma(n) / gcd(sigma(n), phi(sigma(n))).
4
1, 3, 2, 7, 3, 3, 2, 15, 13, 3, 3, 7, 7, 3, 3, 31, 3, 13, 5, 7, 2, 3, 3, 15, 31, 7, 5, 7, 15, 3, 2, 7, 3, 3, 3, 91, 19, 15, 7, 15, 7, 3, 11, 7, 13, 3, 3, 31, 19, 31, 3, 7, 3, 15, 3, 15, 5, 15, 15, 7, 31, 3, 13, 127, 7, 3, 17, 7, 3, 3, 3, 65, 37, 19, 31, 35, 3, 7, 5, 31, 11, 7, 7, 7, 3, 33, 15, 15, 15, 13, 7, 7, 2, 3
OFFSET
1,2
LINKS
FORMULA
a(n) = A000203(n) / A295313(n) = A109395(A000203(n)).
PROG
(PARI) a(n) = my(sn = sigma(n)); sn/gcd(sn, eulerphi(sn)); \\ Michel Marcus, Nov 23 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Nov 22 2017
STATUS
approved