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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.

A290704 Solutions to 2*x - phi(x) = sigma(x)/2, where phi(x) is the Euler totient function of x.

Table of values

n a(n)
1 1680
2 4200
3 27000
4 175392
5 282960
6 707400
7 1668480
8 3344544
9 5658480
10 14146200
11 48644064
12 90008880
13 130110624
14 225022200
15 357994728
16 460763160
17 607281696
18 1926458352
19 3830537880
20 5857651296
21 7840881216
22 8414628480
23 8704032876
24 8843224500
25 14279194512
26 29522053080

List of values

[1680, 4200, 27000, 175392, 282960, 707400, 1668480, 3344544, 5658480, 14146200, 48644064, 90008880, 130110624, 225022200, 357994728, 460763160, 607281696, 1926458352, 3830537880, 5857651296, 7840881216, 8414628480, 8704032876, 8843224500, 14279194512, 29522053080]

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

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