A383392 - cp's OEIS frontend

A383392 Numbers k such that (sigma(k) + sigma(k + sigma(k))) / k is an integer where sigma(k) = A000203(k) is the sum of the divisors of k.

n	a(n)
1	1
2	3
3	14
4	19
5	27
6	28
7	48
8	139
9	164
10	243
11	496
12	1428
13	1440
14	3360
15	3480
16	5932
17	8128
18	11004
19	19683
20	25296
21	27144
22	31756
23	35616
24	45436
25	47520
26	51480
27	84000
28	115506
29	218520
30	221088
31	288288
32	290520
33	303309
34	414528
35	445788
36	605880
37	1019070
38	1122432
39	2100000
40	2136288

[1, 3, 14, 19, 27, 28, 48, 139, 164, 243, 496, 1428, 1440, 3360, 3480, 5932, 8128, 11004, 19683, 25296, 27144, 31756, 35616, 45436, 47520, 51480, 84000, 115506, 218520, 221088, 288288, 290520, 303309, 414528, 445788, 605880, 1019070, 1122432, 2100000, 2136288]

cp's OEIS Frontend

A383392 Numbers k such that (sigma(k) + sigma(k + sigma(k))) / k is an integer where sigma(k) = A000203(k) is the sum of the divisors of k.

Table of values

List of values