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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.

A165630 Numbers n such that sigma(n)/phi(n) = 25/9, where sigma = A000203, phi = A000010.

Table of values

n a(n)
1 8721
2 10179
3 21489
4 99813
5 203721
6 228417
7 229653
8 250705
9 268047
10 609957
11 1150713
12 1343277
13 2429283
14 2835417
15 2835807
16 2881197
17 3150333
18 3230469
19 3833181
20 4679157
21 4885569
22 5673291
23 6082527
24 6302529
25 6713637
26 6819879
27 7096329
28 9464121
29 10313979
30 12168651

List of values

[8721, 10179, 21489, 99813, 203721, 228417, 229653, 250705, 268047, 609957, 1150713, 1343277, 2429283, 2835417, 2835807, 2881197, 3150333, 3230469, 3833181, 4679157, 4885569, 5673291, 6082527, 6302529, 6713637, 6819879, 7096329, 9464121, 10313979, 12168651]

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

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