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A280491
a(n) = gcd(n,A122111(n)).
5
1, 2, 1, 1, 1, 6, 1, 1, 9, 2, 1, 2, 1, 2, 3, 1, 1, 3, 1, 20, 3, 2, 1, 2, 1, 2, 1, 4, 1, 30, 1, 1, 3, 2, 1, 3, 1, 2, 3, 4, 1, 6, 1, 4, 5, 2, 1, 2, 1, 5, 3, 4, 1, 1, 1, 56, 3, 2, 1, 6, 1, 2, 1, 1, 1, 6, 1, 4, 3, 10, 1, 3, 1, 2, 75, 4, 1, 6, 1, 4, 1, 2, 1, 84, 1, 2, 3, 8, 1, 10, 1, 4, 3, 2, 1, 2, 1, 1, 1, 1, 1, 6, 1, 8, 15, 2, 1, 1, 1, 10, 3, 8, 1, 6, 1, 4, 1, 2
OFFSET
1,2
LINKS
FORMULA
a(n) = gcd(n,A122111(n)).
a(n) = n / A280490(n).
Other identities. For all n >= 1:
a(A122111(n)) = a(n).
PROG
(Scheme) (definec (A280491 n) (gcd n (A122111 n)))
CROSSREFS
Cf. A122111, A280490, also A280489.
Cf. A088902 (the fixed points, n for which a(n) = n).
Sequence in context: A273730 A369964 A326047 * A157118 A156186 A156233
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jan 09 2017
STATUS
approved