cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A081620 Least m with n*(n+1)/2 divisors.

Original entry on oeis.org

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, 543581798400, 2174327193600, 1014686023680
Offset: 1

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Author

Reinhard Zumkeller, Mar 24 2003

Keywords

Links

Crossrefs

Subsequence of A081619.
Cf. A000005, A000217, A005179.

Formula

A000005(a(n)) = A000217(n) and A000005(k) <> n*(n+1)/2 for k < a(n).
a(n) = A005179(A000217(n)) = A005179(n*(n+1)/2).

Extensions

More terms from David Wasserman, Jun 14 2004
a(29)-a(31) from Amiram Eldar, Apr 09 2024
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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