login
A343227
a(n) = sigma(n) / gcd(sigma(n), n+A003415(n)), where A003415 is the arithmetic derivative, and sigma is the sum of divisors of n.
4
1, 1, 1, 7, 1, 12, 1, 3, 13, 18, 1, 1, 1, 24, 24, 31, 1, 1, 1, 21, 32, 36, 1, 15, 31, 42, 20, 14, 1, 72, 1, 9, 48, 54, 48, 91, 1, 60, 56, 5, 1, 96, 1, 21, 13, 72, 1, 31, 19, 93, 72, 49, 1, 8, 72, 30, 80, 90, 1, 21, 1, 96, 52, 127, 84, 144, 1, 9, 96, 48, 1, 65, 1, 114, 62, 35, 96, 168, 1, 93, 121, 126, 1, 14, 108
OFFSET
1,4
FORMULA
a(n) = A000203(n) / A343226(n) = A000203(n) / gcd(A000203(n), n+A003415(n))
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Apr 15 2021
STATUS
approved