A126286 - cp's OEIS frontend

A126286 a(1) = 2, a(n) = n * LeastPrimeFactor(n+1) / LeastPrimeFactor(n).

n	a(n)
1	2
2	3
3	2
4	10
5	2
6	21
7	2
8	12
9	6
10	55
11	2
12	78
13	2
14	21
15	10
16	136
17	2
18	171
19	2
20	30
21	14
22	253
23	2
24	60
25	10
26	39
27	18
28	406
29	2
30	465
31	2
32	48
33	22
34	85
35	14
36	666
37	2
38	57
39	26
40	820
41	2
42	903
43	2
44	66
45	30
46	1081
47	2
48	168
49	14
50	75
51	34
52	1378
53	2
54	135
55	22
56	84
57	38
58	1711
59	2
60	1830
61	2
62	93
63	42
64	160
65	26
66	2211
67	2
68	102
69	46

[2, 3, 2, 10, 2, 21, 2, 12, 6, 55, 2, 78, 2, 21, 10, 136, 2, 171, 2, 30, 14, 253, 2, 60, 10, 39, 18, 406, 2, 465, 2, 48, 22, 85, 14, 666, 2, 57, 26, 820, 2, 903, 2, 66, 30, 1081, 2, 168, 14, 75, 34, 1378, 2, 135, 22, 84, 38, 1711, 2, 1830, 2, 93, 42, 160, 26, 2211, 2, 102, 46]

cp's OEIS Frontend

A126286 a(1) = 2, a(n) = n * LeastPrimeFactor(n+1) / LeastPrimeFactor(n).

Table of values

List of values