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A204086 Least term of A004767 with exactly 2n divisors. 3
3, 15, 63, 135, 567, 315, 5103, 1155, 1575, 2835, 413343, 4095, 3720087, 25515, 14175, 10395, 301327047, 20475, 2711943423, 36855, 127575, 2066715, 219667417263, 51975, 354375, 18600435, 121275, 331695, 160137547184727, 184275, 1441237924662543, 135135 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

For odd prime p, a(p) = 3^(p-1)*7.

LINKS

Ray Chandler, Table of n, a(n) for n = 1..2098 (a(2099) exceeds 1000 digits).

FORMULA

a(n) = min{d|n: A018782(d) * A204046(n/d)}.

a(n) = 4*A078714(n)-1.

CROSSREFS

Cf. A004767, A018782, A204046, A078714.

Sequence in context: A122671 A067562 A062211 * A171761 A218313 A218190

Adjacent sequences:  A204083 A204084 A204085 * A204087 A204088 A204089

KEYWORD

nonn

AUTHOR

Ray Chandler, Jan 10 2012

STATUS

approved

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Last modified June 20 06:36 EDT 2013. Contains 226422 sequences.