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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A287621 a(n) = least k such that A287620(k) = n.

Original entry on oeis.org

1, 2, 3, 18, 5, 6, 7, 450, 24, 10, 11, 150, 13, 14, 15, 22050, 17, 192, 19, 90, 21, 22, 23, 7350, 160, 26, 3000, 126, 29, 30, 31, 2668050, 33, 34, 35, 4800, 37, 38, 39, 4410, 41, 42, 43, 198, 120, 46, 47, 705600, 896, 1440, 51, 234, 53, 24000, 55, 3150, 57, 58
Offset: 1

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Author

Rémy Sigrist, May 28 2017

Keywords

Comments

a(n) >= n.
a(n) = n iff n is squarefree (A005117).
If n = p_1 * ... * p_k where p_1, ..., p_k are prime, then a(n) <= prime(1)^p_1 * ... * prime(k)^p_k.

Examples

			See illustrations of the first terms in Links section.

Links

Crossrefs

Cf. A005117, A287620.
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