A205525 - cp's OEIS frontend

A205525 Nonprime numbers k such that gcd(k, sigma(k)) == sigma(k) (mod k).

n	a(n)
1	1
2	6
3	12
4	18
5	20
6	24
7	28
8	40
9	56
10	88
11	104
12	120
13	180
14	196
15	224
16	234
17	240
18	360
19	368
20	420
21	464
22	496
23	540
24	600
25	650
26	672
27	780
28	992
29	1080
30	1344
31	1504
32	1872
33	1888
34	1890
35	1952
36	2016
37	2184
38	2352
39	2376
40	2688
41	3192
42	3276
43	3724
44	3744
45	4284
46	4320
47	4680
48	5292
49	5376
50	5624

[1, 6, 12, 18, 20, 24, 28, 40, 56, 88, 104, 120, 180, 196, 224, 234, 240, 360, 368, 420, 464, 496, 540, 600, 650, 672, 780, 992, 1080, 1344, 1504, 1872, 1888, 1890, 1952, 2016, 2184, 2352, 2376, 2688, 3192, 3276, 3724, 3744, 4284, 4320, 4680, 5292, 5376, 5624]

cp's OEIS Frontend

A205525 Nonprime numbers k such that gcd(k, sigma(k)) == sigma(k) (mod k).

Table of values

List of values