A219093 Denominator of the least reduced fraction b/c > 1 using divisors b and c of n.

1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 3, 1, 1, 3, 1, 1, 2, 1, 4, 3, 1, 1, 3, 1, 1, 1, 4, 1, 5, 1, 1, 1, 1, 5, 3, 1, 1, 1, 4, 1, 6, 1, 1, 3, 1, 1, 3, 1, 1, 1, 1, 1, 2, 5, 7, 1, 1, 1, 5, 1, 1, 7, 1, 5, 2, 1, 1, 1, 5, 1, 8, 1, 1, 3, 1, 7, 2, 1, 4, 1, 1, 1, 6, 5, 1, 1, 8

Offset

2,5

Comments

The product b*c divides n.

Links

Clark Kimberling, Table of n, a(n) for n = 2..10000

Example

For n = 2,...,12, the fractions are 2/1, 3/1, 2/1, 5/1, 3/2, 7/1, 2/1, 3/1, 2/1, 11/1, 4/3, so that
A218993 = (2, 3, 2, 5, 3, 7, 2, 3, 2, 11, 4, ... );
A219093 = (1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 3, ... );
A219094 = (1, 1, 2, 1, 1, 1, 4, 3, 5, 1, 1, ... );
A219095 = (6, 12, 15, 18, 20, 21, 24, 28, 30, 35, 36, ... ).

Mathematica

(See A218993.)

Crossrefs

Cf. A218993, A219094, A219095.

Sequence in context: A328672 A368465 A325355 * A062760 A323163 A322318

Adjacent sequences: A219090 A219091 A219092 * A219094 A219095 A219096

Keyword

nonn,easy

Author

Clark Kimberling, Feb 06 2013

Status

approved