A078701 - cp's OEIS frontend

A078701 Least odd prime factor of n, or 1 if no such factor exists.

n	a(n)
1	1
2	1
3	3
4	1
5	5
6	3
7	7
8	1
9	3
10	5
11	11
12	3
13	13
14	7
15	3
16	1
17	17
18	3
19	19
20	5
21	3
22	11
23	23
24	3
25	5
26	13
27	3
28	7
29	29
30	3
31	31
32	1
33	3
34	17
35	5
36	3
37	37
38	19
39	3
40	5
41	41
42	3
43	43
44	11
45	3
46	23
47	47
48	3
49	7
50	5
51	3
52	13
53	53
54	3
55	5
56	7
57	3
58	29
59	59
60	3
61	61
62	31
63	3
64	1
65	5
66	3
67	67
68	17
69	3
70	5
71	71
72	3
73	73
74	37
75	3
76	19
77	7
78	3
79	79
80	5
81	3
82	41
83	83
84	3
85	5
86	43
87	3
88	11

[1, 1, 3, 1, 5, 3, 7, 1, 3, 5, 11, 3, 13, 7, 3, 1, 17, 3, 19, 5, 3, 11, 23, 3, 5, 13, 3, 7, 29, 3, 31, 1, 3, 17, 5, 3, 37, 19, 3, 5, 41, 3, 43, 11, 3, 23, 47, 3, 7, 5, 3, 13, 53, 3, 5, 7, 3, 29, 59, 3, 61, 31, 3, 1, 5, 3, 67, 17, 3, 5, 71, 3, 73, 37, 3, 19, 7, 3, 79, 5, 3, 41, 83, 3, 5, 43, 3, 11]

cp's OEIS Frontend

A078701 Least odd prime factor of n, or 1 if no such factor exists.

Table of values

List of values

n	a(n)
1	1
2	1
3	3
4	1
5	5
6	3
7	7
8	1
9	3
10	5
11	11
12	3
13	13
14	7
15	3
16	1
17	17
18	3
19	19
20	5
21	3
22	11
23	23
24	3
25	5
26	13
27	3
28	7
29	29
30	3
31	31
32	1
33	3
34	17
35	5
36	3
37	37
38	19
39	3
40	5
41	41
42	3
43	43
44	11
45	3
46	23
47	47
48	3
49	7
50	5
51	3
52	13
53	53
54	3
55	5
56	7
57	3
58	29
59	59
60	3
61	61
62	31
63	3
64	1
65	5
66	3
67	67
68	17
69	3
70	5
71	71
72	3
73	73
74	37
75	3
76	19
77	7
78	3
79	79
80	5
81	3
82	41
83	83
84	3
85	5
86	43
87	3
88	11

n	a(n)
1	1
2	1
3	3
4	1
5	5
6	3
7	7
8	1
9	3
10	5
11	11
12	3
13	13
14	7
15	3
16	1
17	17
18	3
19	19
20	5
21	3
22	11
23	23
24	3
25	5
26	13
27	3
28	7
29	29
30	3
31	31
32	1
33	3
34	17
35	5
36	3
37	37
38	19
39	3
40	5
41	41
42	3
43	43
44	11
45	3
46	23
47	47
48	3
49	7
50	5
51	3
52	13
53	53
54	3
55	5
56	7
57	3
58	29
59	59
60	3
61	61
62	31
63	3
64	1
65	5
66	3
67	67
68	17
69	3
70	5
71	71
72	3
73	73
74	37
75	3
76	19
77	7
78	3
79	79
80	5
81	3
82	41
83	83
84	3
85	5
86	43
87	3
88	11

n	a(n)
1	1
2	1
3	3
4	1
5	5
6	3
7	7
8	1
9	3
10	5
11	11
12	3
13	13
14	7
15	3
16	1
17	17
18	3
19	19
20	5
21	3
22	11
23	23
24	3
25	5
26	13
27	3
28	7
29	29
30	3
31	31
32	1
33	3
34	17
35	5
36	3
37	37
38	19
39	3
40	5
41	41
42	3
43	43
44	11
45	3
46	23
47	47
48	3
49	7
50	5
51	3
52	13
53	53
54	3
55	5
56	7
57	3
58	29
59	59
60	3
61	61
62	31
63	3
64	1
65	5
66	3
67	67
68	17
69	3
70	5
71	71
72	3
73	73
74	37
75	3
76	19
77	7
78	3
79	79
80	5
81	3
82	41
83	83
84	3
85	5
86	43
87	3
88	11