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A086921 Least number with at least n divisors that are at most its square root. 4
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified August 14 01:29 EDT 2020. Contains 336473 sequences. (Running on oeis4.)