A165661 Triangle read by rows: denominator of n/binomial(n,m).

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 5, 10, 5, 1, 1, 1, 1, 3, 5, 5, 3, 1, 1, 1, 1, 7, 7, 35, 7, 7, 1, 1, 1, 1, 4, 28, 14, 14, 28, 4, 1, 1, 1, 1, 9, 12, 21, 126, 21, 12, 9, 1, 1, 1, 1, 5, 15, 30, 42, 42, 30, 15, 5, 1, 1, 1, 1, 11, 55, 165, 66, 77, 66, 165, 55, 11, 1, 1

Offset: 0

Author

Franklin T. Adams-Watters, Sep 24 2009

Keywords

• frac
• nonn
• tabl

Comments

First difference from A107711 is at T(10,4) = 21 instead of 42.

Crossrefs

Cf. A159335 (numerators), A107711, A007318, A109004.

Formula

T(n,m) = binomial(n,m)/gcd(n,binomial(n,m)).