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.

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

Links

Antti Karttunen, Table of n, a(n) for n = 1..16384

Antti Karttunen, Data supplement: n, a(n) computed for n = 1..65537

Index entries for sequences related to sigma(n)

Formula

a(n) = A000203(n) / A343226(n) = A000203(n) / gcd(A000203(n), n+A003415(n))

Crossrefs

Cf. A000203, A003415, A129283, A343226.

Sequence in context: A211836 A165949 A322565 * A339965 A364094 A347132

Adjacent sequences: A343224 A343225 A343226 * A343228 A343229 A343230

Keyword

nonn

Author

Antti Karttunen, Apr 15 2021

Status

approved