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A339967
a(n) = gcd(sigma(n), n+2).
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
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 A373364 A107463
KEYWORD
nonn
AUTHOR
Antti Karttunen, Dec 25 2020
STATUS
approved