A280488 -id:A280488 - cp's OEIS frontend

A280489 a(n) = gcd(n,A241909(n)).

1, 2, 1, 1, 1, 3, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 1, 3, 1, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 15, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 1, 3, 1, 1, 5, 1, 1, 1, 1, 5, 3, 1, 1, 3, 1, 7, 3, 1, 1, 5, 1, 1, 1, 1, 1, 3, 1, 1, 3, 5, 1, 1, 1, 1, 15, 1, 1, 3, 1, 1, 1, 1, 1, 7, 1, 1, 3, 1, 1, 3, 1, 1, 3, 1, 1, 1, 1, 1, 1, 25, 1, 3, 1, 1, 15, 1, 1, 1, 1, 5, 3, 1, 1, 3, 1, 1, 1, 1, 1

Offset: 1

Antti Karttunen, Jan 09 2017

nonn

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

Cf. A241909, A280488, A280491.

(define (A280489 n) (gcd n (A241909 n)))

a(n) = gcd(n,A241909(n)).
a(n) = n / A280488(n).
Other identities. For all n >= 1:
a(A241909(n)) = a(n).

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

Original entry on oeis.org

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

Antti Karttunen, Jan 09 2017

nonn

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

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

Cf. A122111, A280491, also A278520, A280488.

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

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

cp's OEIS Frontend

A280489 a(n) = gcd(n,A241909(n)).

Views

Author

Keywords

Links

Crossrefs

Programs

Scheme

Formula