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.

A338364 a(n) = Product_{k=1..n} phi(prime(k)-1).

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 4
5 16
6 64
7 512
8 3072
9 30720
10 368640
11 2949120
12 35389440
13 566231040
14 6794772480
15 149484994560
16 3587639869440
17 100453916344320
18 1607262661509120
19 32145253230182400
20 771486077524377600
21 18515665860585062400
22 444375980654041497600
23 17775039226161659904000

List of values

[1, 1, 1, 2, 4, 16, 64, 512, 3072, 30720, 368640, 2949120, 35389440, 566231040, 6794772480, 149484994560, 3587639869440, 100453916344320, 1607262661509120, 32145253230182400, 771486077524377600, 18515665860585062400, 444375980654041497600, 17775039226161659904000]

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

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