A086956 - cp's OEIS frontend

A086956 a(1)=1, for n>1: a(n) is the smallest divisor of n occurring earlier at most twice.

n	a(n)
1	1
2	1
3	1
4	2
5	5
6	2
7	7
8	2
9	3
10	5
11	11
12	3
13	13
14	7
15	3
16	4
17	17
18	6
19	19
20	4
21	7
22	11
23	23
24	4
25	5
26	13
27	9
28	14
29	29
30	6
31	31
32	8
33	11
34	17
35	35
36	6
37	37
38	19
39	13
40	8
41	41
42	14
43	43
44	22
45	9
46	23
47	47
48	8
49	49
50	10
51	17
52	26
53	53
54	9
55	55
56	14
57	19
58	29
59	59
60	10
61	61
62	31
63	21
64	16
65	65
66	22
67	67
68	34
69	23
70	10
71	71
72	12
73	73
74	37
75	15
76	38

[1, 1, 1, 2, 5, 2, 7, 2, 3, 5, 11, 3, 13, 7, 3, 4, 17, 6, 19, 4, 7, 11, 23, 4, 5, 13, 9, 14, 29, 6, 31, 8, 11, 17, 35, 6, 37, 19, 13, 8, 41, 14, 43, 22, 9, 23, 47, 8, 49, 10, 17, 26, 53, 9, 55, 14, 19, 29, 59, 10, 61, 31, 21, 16, 65, 22, 67, 34, 23, 10, 71, 12, 73, 37, 15, 38]

cp's OEIS Frontend

A086956 a(1)=1, for n>1: a(n) is the smallest divisor of n occurring earlier at most twice.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	2
5	5
6	2
7	7
8	2
9	3
10	5
11	11
12	3
13	13
14	7
15	3
16	4
17	17
18	6
19	19
20	4
21	7
22	11
23	23
24	4
25	5
26	13
27	9
28	14
29	29
30	6
31	31
32	8
33	11
34	17
35	35
36	6
37	37
38	19
39	13
40	8
41	41
42	14
43	43
44	22
45	9
46	23
47	47
48	8
49	49
50	10
51	17
52	26
53	53
54	9
55	55
56	14
57	19
58	29
59	59
60	10
61	61
62	31
63	21
64	16
65	65
66	22
67	67
68	34
69	23
70	10
71	71
72	12
73	73
74	37
75	15
76	38

n	a(n)
1	1
2	1
3	1
4	2
5	5
6	2
7	7
8	2
9	3
10	5
11	11
12	3
13	13
14	7
15	3
16	4
17	17
18	6
19	19
20	4
21	7
22	11
23	23
24	4
25	5
26	13
27	9
28	14
29	29
30	6
31	31
32	8
33	11
34	17
35	35
36	6
37	37
38	19
39	13
40	8
41	41
42	14
43	43
44	22
45	9
46	23
47	47
48	8
49	49
50	10
51	17
52	26
53	53
54	9
55	55
56	14
57	19
58	29
59	59
60	10
61	61
62	31
63	21
64	16
65	65
66	22
67	67
68	34
69	23
70	10
71	71
72	12
73	73
74	37
75	15
76	38

n	a(n)
1	1
2	1
3	1
4	2
5	5
6	2
7	7
8	2
9	3
10	5
11	11
12	3
13	13
14	7
15	3
16	4
17	17
18	6
19	19
20	4
21	7
22	11
23	23
24	4
25	5
26	13
27	9
28	14
29	29
30	6
31	31
32	8
33	11
34	17
35	35
36	6
37	37
38	19
39	13
40	8
41	41
42	14
43	43
44	22
45	9
46	23
47	47
48	8
49	49
50	10
51	17
52	26
53	53
54	9
55	55
56	14
57	19
58	29
59	59
60	10
61	61
62	31
63	21
64	16
65	65
66	22
67	67
68	34
69	23
70	10
71	71
72	12
73	73
74	37
75	15
76	38