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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.

A217863 a(n) = phi(lcm(1,2,3,...,n)), where phi is Euler's totient function.

Table of values

n a(n)
1 1
2 1
3 2
4 4
5 16
6 16
7 96
8 192
9 576
10 576
11 5760
12 5760
13 69120
14 69120
15 69120
16 138240
17 2211840
18 2211840
19 39813120
20 39813120
21 39813120
22 39813120
23 875888640
24 875888640
25 4379443200
26 4379443200
27 13138329600
28 13138329600
29 367873228800
30 367873228800
31 11036196864000

List of values

[1, 1, 2, 4, 16, 16, 96, 192, 576, 576, 5760, 5760, 69120, 69120, 69120, 138240, 2211840, 2211840, 39813120, 39813120, 39813120, 39813120, 875888640, 875888640, 4379443200, 4379443200, 13138329600, 13138329600, 367873228800, 367873228800, 11036196864000]

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

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