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A141264 Number of divisors of m^2 where m is the smallest number with exactly n divisors. 1
1, 3, 5, 9, 9, 15, 13, 21, 25, 27, 21, 45, 25, 39, 45, 63, 33, 75, 37, 81, 65, 63, 45, 105, 81, 75, 125, 117, 57, 135, 61, 189, 105, 99, 117, 225, 73, 111, 125, 243, 81, 195, 85, 189, 225, 135, 93, 315, 169, 243, 165, 225, 105, 375, 189, 351, 185, 171, 117, 405, 121, 183 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Variant of A103578.

LINKS

Table of n, a(n) for n=1..62.

FORMULA

a(n)=A000005((A005179(n))^2). [From R. J. Mathar, Aug 31 2008]

EXAMPLE

a(8) = 21 because smallest number with 8 divisors is 24, 24^2 = 576 and 576 has 21 divisors.

CROSSREFS

Sequence in context: A160173 A256537 A092996 * A062949 A166651 A081500

Adjacent sequences:  A141261 A141262 A141263 * A141265 A141266 A141267

KEYWORD

nonn

AUTHOR

J. Lowell, Aug 30 2008

EXTENSIONS

Extended beyond a(8) by R. J. Mathar, Sep 01 2008

STATUS

approved

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Last modified August 8 08:27 EDT 2020. Contains 336293 sequences. (Running on oeis4.)