A074391 - cp's OEIS frontend

A074391 a(n) is the smallest number such that gcd(a(n), sigma(a(n))) = n.

n	a(n)
1	1
2	10
3	15
4	12
5	95
6	6
7	91
8	56
9	153
10	40
11	473
12	24
13	117
14	182
15	135
16	336
17	1139
18	90
19	703
20	380
21	861
22	946
23	3151
24	168
25	3725
26	468
27	1431
28	28
29	5017
30	570
31	775
32	992
33	891
34	2176
35	4865
36	792
37	2701
38	1406
39	585
40	280
41	6683
42	546
43	11051
44	1892
45	1305
46	6302
47	13207
48	528
49	4753
50	5800

[1, 10, 15, 12, 95, 6, 91, 56, 153, 40, 473, 24, 117, 182, 135, 336, 1139, 90, 703, 380, 861, 946, 3151, 168, 3725, 468, 1431, 28, 5017, 570, 775, 992, 891, 2176, 4865, 792, 2701, 1406, 585, 280, 6683, 546, 11051, 1892, 1305, 6302, 13207, 528, 4753, 5800]

cp's OEIS Frontend

A074391 a(n) is the smallest number such that gcd(a(n), sigma(a(n))) = n.

Table of values

List of values