A344766 a(n) = gcd(sigma(n), A011772(n)).

1, 3, 2, 7, 2, 3, 2, 15, 1, 2, 2, 4, 2, 1, 1, 31, 2, 1, 2, 3, 2, 1, 2, 15, 1, 6, 2, 7, 2, 3, 2, 63, 1, 2, 2, 1, 2, 1, 4, 15, 2, 4, 2, 4, 3, 1, 2, 4, 3, 3, 1, 1, 2, 3, 2, 24, 2, 2, 2, 3, 2, 1, 1, 127, 1, 1, 2, 2, 1, 4, 2, 3, 2, 6, 4, 28, 3, 12, 2, 2, 1, 2, 2, 16, 2, 1, 1, 4, 2, 1, 1, 1, 2, 1, 1, 63, 2, 3, 4, 1, 2, 3, 2, 2, 2

Offset: 1

Author

Antti Karttunen, May 30 2021

Keywords

• nonn

Links

• Antti Karttunen, Table of n, a(n) for n = 1..65537
• Index entries for sequences related to sigma(n)

Crossrefs

Cf. A000203, A011772, A344765.

Cf. also A344764.

Programs

PARI

A344766(n) = gcd(sigma(n), A011772(n));

Formula

a(n) = gcd(A000203(n), A011772(n)).

a(n) = gcd(A000203(n), A344765(n)) = gcd(A011772(n), A344765(n)).