A243455 - cp's OEIS frontend

A243455 Numbers n such that (n, sigma(n), tau(n)) lies on a sphere with integral radius centered at the origin, i.e., n^2 + sigma(n)^2 + tau(n)^2 is a square.

n	a(n)
1	6
2	61
3	2089
4	3606
5	18585
6	28710
7	70981
8	121374
9	176529
10	520320
11	970783
12	62788800
13	114682878
14	144653952
15	174635334
16	182054895
17	3857228169
18	4349012190
19	15994971740
20	17587660602
21	22842677823
22	65183331200
23	66928439760

[6, 61, 2089, 3606, 18585, 28710, 70981, 121374, 176529, 520320, 970783, 62788800, 114682878, 144653952, 174635334, 182054895, 3857228169, 4349012190, 15994971740, 17587660602, 22842677823, 65183331200, 66928439760]

cp's OEIS Frontend

A243455 Numbers n such that (n, sigma(n), tau(n)) lies on a sphere with integral radius centered at the origin, i.e., n^2 + sigma(n)^2 + tau(n)^2 is a square.

Table of values

List of values