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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.

A368498 a(n) is the smallest number that can be written in exactly n ways as the sum of positive integer powers of its distinct prime factors, or -1 if no such number exists.

Table of values

n a(n)
0 1
1 2
2 30
3 270
4 2730
5 4290

List of values

[1, 2, 30, 270, 2730, 4290]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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