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.

A377402 Least k such that the ratio of the number of residues mod k coprime to k and the number of primitive roots mod k is greater than or equal to n for k such that at least one primitive root mod k exists. Equivalently, k such that floor(phi(k)/phi(phi(k)) is a record value for those k belonging to A033948.

Table of values

n a(n)
1 1
2 3
3 7
4 211
5 43891
6 300690391

List of values

[1, 3, 7, 211, 43891, 300690391]

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

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