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

1,2

Comments

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

Links

Table of n, a(n) for n=1..44.

Formula

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

Crossrefs

Cf. A038548, A038549, A004778.

Cf. A118224.

Sequence in context: A301175 A008122 A008103 * A004778 A038549 A008081

Adjacent sequences: A086918 A086919 A086920 * A086922 A086923 A086924

Keyword

easy,nonn

Author

N. J. A. Sloane, Sep 19 2003

Extensions

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

Status

approved