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.

A226563 Numbers k such that sum(d|k, sigma(d)^2) is a multiple of k.

Table of values

n a(n)
1 1
2 2
3 10
4 185
5 370
6 3145
7 6290
8 40885
9 53465
10 63750
11 81770
12 106930
13 241400
14 348750
15 427720
16 828750
17 866200
18 1207000
19 1306875
20 1635449
21 2613750
22 3138200
23 3270898
24 7149375
25 8054345
26 8177245
27 14298750
28 14725400
29 15691000
30 16108690
31 16354490
32 16989375
33 30368120

List of values

[1, 2, 10, 185, 370, 3145, 6290, 40885, 53465, 63750, 81770, 106930, 241400, 348750, 427720, 828750, 866200, 1207000, 1306875, 1635449, 2613750, 3138200, 3270898, 7149375, 8054345, 8177245, 14298750, 14725400, 15691000, 16108690, 16354490, 16989375, 30368120]

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

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