A126289 - cp's OEIS frontend

A126289 a(1) = 1, a(2) = 1, a(n) = n * LargestPrimeFactor(n-1) / LargestPrimeFactor(n).

n	a(n)
1	1
2	1
3	2
4	6
5	2
6	10
7	3
8	28
9	6
10	6
11	5
12	44
13	3
14	26
15	21
16	40
17	2
18	102
19	3
20	76
21	15
22	14
23	11
24	184
25	15
26	10
27	117
28	12
29	7
30	174
31	5
32	496
33	6
34	22
35	85
36	84
37	3
38	74
39	57
40	104
41	5
42	246
43	7
44	172
45	99
46	10
47	23
48	752
49	21
50	70
51	15
52	68
53	13
54	954
55	15
56	88
57	21
58	38
59	29
60	708
61	5
62	122
63	279
64	224
65	10
66	78
67	11
68	268
69	51
70	230
71	7

[1, 1, 2, 6, 2, 10, 3, 28, 6, 6, 5, 44, 3, 26, 21, 40, 2, 102, 3, 76, 15, 14, 11, 184, 15, 10, 117, 12, 7, 174, 5, 496, 6, 22, 85, 84, 3, 74, 57, 104, 5, 246, 7, 172, 99, 10, 23, 752, 21, 70, 15, 68, 13, 954, 15, 88, 21, 38, 29, 708, 5, 122, 279, 224, 10, 78, 11, 268, 51, 230, 7]

cp's OEIS Frontend

A126289 a(1) = 1, a(2) = 1, a(n) = n * LargestPrimeFactor(n-1) / LargestPrimeFactor(n).

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	6
5	2
6	10
7	3
8	28
9	6
10	6
11	5
12	44
13	3
14	26
15	21
16	40
17	2
18	102
19	3
20	76
21	15
22	14
23	11
24	184
25	15
26	10
27	117
28	12
29	7
30	174
31	5
32	496
33	6
34	22
35	85
36	84
37	3
38	74
39	57
40	104
41	5
42	246
43	7
44	172
45	99
46	10
47	23
48	752
49	21
50	70
51	15
52	68
53	13
54	954
55	15
56	88
57	21
58	38
59	29
60	708
61	5
62	122
63	279
64	224
65	10
66	78
67	11
68	268
69	51
70	230
71	7

n	a(n)
1	1
2	1
3	2
4	6
5	2
6	10
7	3
8	28
9	6
10	6
11	5
12	44
13	3
14	26
15	21
16	40
17	2
18	102
19	3
20	76
21	15
22	14
23	11
24	184
25	15
26	10
27	117
28	12
29	7
30	174
31	5
32	496
33	6
34	22
35	85
36	84
37	3
38	74
39	57
40	104
41	5
42	246
43	7
44	172
45	99
46	10
47	23
48	752
49	21
50	70
51	15
52	68
53	13
54	954
55	15
56	88
57	21
58	38
59	29
60	708
61	5
62	122
63	279
64	224
65	10
66	78
67	11
68	268
69	51
70	230
71	7

n	a(n)
1	1
2	1
3	2
4	6
5	2
6	10
7	3
8	28
9	6
10	6
11	5
12	44
13	3
14	26
15	21
16	40
17	2
18	102
19	3
20	76
21	15
22	14
23	11
24	184
25	15
26	10
27	117
28	12
29	7
30	174
31	5
32	496
33	6
34	22
35	85
36	84
37	3
38	74
39	57
40	104
41	5
42	246
43	7
44	172
45	99
46	10
47	23
48	752
49	21
50	70
51	15
52	68
53	13
54	954
55	15
56	88
57	21
58	38
59	29
60	708
61	5
62	122
63	279
64	224
65	10
66	78
67	11
68	268
69	51
70	230
71	7