A277553 - cp's OEIS frontend

A277553 Numbers k such that the sum of the divisors of k is divisible by the number of divisors of k, and the sum of the squares of the divisors of k is divisible by the sum of the divisors of k.

n	a(n)
1	1
2	20
3	49
4	169
5	361
6	500
7	605
8	961
9	980
10	1025
11	1369
12	1445
13	1700
14	1849
15	2645
16	3380
17	3721
18	4205
19	4352
20	4489
21	4693
22	5329
23	6241
24	7220
25	8228
26	8281
27	8405
28	9409
29	9425
30	10609
31	11045
32	11849
33	11881
34	12493
35	12500
36	14045
37	14580
38	14641
39	15125
40	16129
41	17405
42	17689
43	18785

[1, 20, 49, 169, 361, 500, 605, 961, 980, 1025, 1369, 1445, 1700, 1849, 2645, 3380, 3721, 4205, 4352, 4489, 4693, 5329, 6241, 7220, 8228, 8281, 8405, 9409, 9425, 10609, 11045, 11849, 11881, 12493, 12500, 14045, 14580, 14641, 15125, 16129, 17405, 17689, 18785]

cp's OEIS Frontend

A277553 Numbers k such that the sum of the divisors of k is divisible by the number of divisors of k, and the sum of the squares of the divisors of k is divisible by the sum of the divisors of k.

Table of values

List of values