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.

A222009 (Product(primitive roots of p) - 1)/p, where p = prime(n) and n > 2.

Table of values

n a(n)
3 1
4 2
5 61
6 71
7 684847
8 8621
9 4768743913
10 192769238731
11 31302497
12 3624013907027
13 3389284413733950439
14 20347152500093
15 73535243111830065216714893617
16 579021662547635771462791245283
17 38283945111344558723552263341142779661
18 60296900399609972459
19 271233083114844569997128597
20 1382959355737627871079165208413804169

List of values

[1, 2, 61, 71, 684847, 8621, 4768743913, 192769238731, 31302497, 3624013907027, 3389284413733950439, 20347152500093, 73535243111830065216714893617, 579021662547635771462791245283, 38283945111344558723552263341142779661, 60296900399609972459, 271233083114844569997128597, 1382959355737627871079165208413804169]

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

Content is available under The OEIS End-User License Agreement.