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.

A328302 For n > 1, a(n) is the least number > 0 for which it takes n-2 steps to reach a squarefree number by applying arithmetic derivative (A003415) zero or multiple times. a(1) = 4 is the least number for which no squarefree number is ever reached.

Table of values

n a(n)
1 4
2 1
3 9
4 50
5 306
6 5831
7 20230
8 52283
9 286891
10 10820131
11 38452606

List of values

[4, 1, 9, 50, 306, 5831, 20230, 52283, 286891, 10820131, 38452606]

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

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