A204086 - OEIS

A204086

Least term of A004767 with exactly 2n divisors.

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

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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.