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A081620 Least m with n*(n+1)/2 divisors. 1
1, 4, 12, 48, 144, 576, 960, 1260, 3600, 82944, 46080, 184320, 2985984, 129600, 55440, 6881280, 14745600, 58982400, 106168320, 907200, 18662400, 247669456896, 1321205760, 2494800, 207360000, 45158400, 7761600, 978447237120 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A000005(a(n))=A000217(n) and A000005(k)<>n*(n+1)/2 for k<a(n).

LINKS

Table of n, a(n) for n=1..28.

CROSSREFS

Subsequence of A081619.

a(n) = A005179(A000217(n)) = A005179(n*(n+1)/2)

Sequence in context: A255230 A253087 A262414 * A282023 A149376 A149377

Adjacent sequences:  A081617 A081618 A081619 * A081621 A081622 A081623

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Mar 24 2003

EXTENSIONS

More terms from David Wasserman, Jun 14 2004

STATUS

approved

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Last modified May 22 06:32 EDT 2019. Contains 323478 sequences. (Running on oeis4.)