A280490 a(n) = n / A280491(n) = n / gcd(n,A122111(n)).

1, 1, 3, 4, 5, 1, 7, 8, 1, 5, 11, 6, 13, 7, 5, 16, 17, 6, 19, 1, 7, 11, 23, 12, 25, 13, 27, 7, 29, 1, 31, 32, 11, 17, 35, 12, 37, 19, 13, 10, 41, 7, 43, 11, 9, 23, 47, 24, 49, 10, 17, 13, 53, 54, 55, 1, 19, 29, 59, 10, 61, 31, 63, 64, 65, 11, 67, 17, 23, 7, 71, 24, 73, 37, 1, 19, 77, 13, 79, 20, 81, 41, 83, 1, 85, 43, 29, 11, 89, 9, 91, 23, 31, 47, 95, 48, 97

Offset

1,3

Links

Antti Karttunen, Table of n, a(n) for n = 1..8192

Formula

a(n) = n / A280491(n) = n / gcd(n,A122111(n)).

Prog

(Scheme) (define (A280490 n) (/ n (A280491 n)))

Crossrefs

Cf. A088902 (the positions of 1's).

Cf. A122111, A280491, also A278520, A280488.

Sequence in context: A225405 A051993 A174530 * A350091 A135347 A370116

Adjacent sequences: A280487 A280488 A280489 * A280491 A280492 A280493

Keyword

nonn

Author

Antti Karttunen, Jan 09 2017

Status

approved