A086921 Least number with at least n divisors that are at most its square root.

1, 4, 12, 24, 36, 60, 120, 120, 180, 240, 360, 360, 720, 720, 720, 840, 1260, 1260, 1680, 1680, 2520, 2520, 2520, 2520, 5040, 5040, 5040, 5040, 5040, 5040, 7560, 7560, 10080, 10080, 10080, 10080, 15120, 15120, 15120, 15120, 20160, 20160, 25200, 25200

Offset: 1

Author

N. J. A. Sloane, Sep 19 2003

Keywords

• easy
• nonn

Comments

Smallest number m such that can write m = p*q (with p <= q) in at least n ways.

Crossrefs

Cf. A038548, A038549, A004778.

Cf. A118224.

Formula

a(n) = A061799(2n-1). - David Wasserman, Apr 12 2005

Extensions

More terms from Vladeta Jovovic and Ray Chandler, Sep 20 2003