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.

A076532 Numbers n such that sopf(sigma(n)) = sigma(sopf(n)), where sopf(x) = sum of the distinct prime factors of x.

Table of values

n a(n)
1 2
2 90
3 425
4 490
5 605
6 630
7 726
8 735
9 750
10 816
11 2250
12 2695
13 3185
14 3234
15 3420
16 3822
17 4176
18 5096
19 5250
20 6591
21 7644
22 8470
23 9100
24 9425
25 10296
26 10780
27 11616
28 11638
29 12321
30 15750
31 16940
32 18096
33 22736
34 23276
35 25578
36 27360
37 27783
38 28500
39 31900
40 36400

List of values

[2, 90, 425, 490, 605, 630, 726, 735, 750, 816, 2250, 2695, 3185, 3234, 3420, 3822, 4176, 5096, 5250, 6591, 7644, 8470, 9100, 9425, 10296, 10780, 11616, 11638, 12321, 15750, 16940, 18096, 22736, 23276, 25578, 27360, 27783, 28500, 31900, 36400]

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

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