A339967 a(n) = gcd(sigma(n), n+2).

1, 1, 1, 1, 1, 4, 1, 5, 1, 6, 1, 14, 1, 8, 1, 1, 1, 1, 1, 2, 1, 12, 1, 2, 1, 14, 1, 2, 1, 8, 1, 1, 1, 18, 1, 1, 1, 20, 1, 6, 1, 4, 1, 2, 1, 24, 1, 2, 3, 1, 1, 2, 1, 8, 3, 2, 1, 30, 1, 2, 1, 32, 13, 1, 1, 4, 1, 14, 1, 72, 1, 1, 1, 38, 1, 2, 1, 8, 1, 2, 1, 42, 1, 2, 3, 44, 1, 90, 1, 2, 1, 2, 1, 48, 1, 14, 1, 1, 1, 1, 1, 8, 1, 2, 1

Offset

1,6

Links

Antti Karttunen, Table of n, a(n) for n = 1..65537

Index entries for sequences related to sigma(n)

Prog

(PARI) A339967(n) = gcd(sigma(n), n+2);

Crossrefs

Cf. A000203.

Cf. A339968 (positions of ones).

Cf. also A009194, A339964.

Sequence in context: A060044 A323413 A019303 * A357311 A107463 A157104

Adjacent sequences: A339964 A339965 A339966 * A339968 A339969 A339970

Keyword

nonn

Author

Antti Karttunen, Dec 25 2020

Status

approved