A119288 - cp's OEIS frontend

A119288 a(n) is the second smallest prime factor of n, or 1 if n is a prime power.

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	3
7	1
8	1
9	1
10	5
11	1
12	3
13	1
14	7
15	5
16	1
17	1
18	3
19	1
20	5
21	7
22	11
23	1
24	3
25	1
26	13
27	1
28	7
29	1
30	3
31	1
32	1
33	11
34	17
35	7
36	3
37	1
38	19
39	13
40	5
41	1
42	3
43	1
44	11
45	5
46	23
47	1
48	3
49	1
50	5
51	17
52	13
53	1
54	3
55	11
56	7
57	19
58	29
59	1
60	3
61	1
62	31
63	7
64	1
65	13
66	3
67	1
68	17
69	23
70	5
71	1
72	3
73	1
74	37
75	5
76	19
77	11
78	3
79	1
80	5
81	1
82	41
83	1
84	3
85	17
86	43
87	29
88	11
89	1
90	3
91	13
92	23

[1, 1, 1, 1, 1, 3, 1, 1, 1, 5, 1, 3, 1, 7, 5, 1, 1, 3, 1, 5, 7, 11, 1, 3, 1, 13, 1, 7, 1, 3, 1, 1, 11, 17, 7, 3, 1, 19, 13, 5, 1, 3, 1, 11, 5, 23, 1, 3, 1, 5, 17, 13, 1, 3, 11, 7, 19, 29, 1, 3, 1, 31, 7, 1, 13, 3, 1, 17, 23, 5, 1, 3, 1, 37, 5, 19, 11, 3, 1, 5, 1, 41, 1, 3, 17, 43, 29, 11, 1, 3, 13, 23]

cp's OEIS Frontend

A119288 a(n) is the second smallest prime factor of n, or 1 if n is a prime power.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	3
7	1
8	1
9	1
10	5
11	1
12	3
13	1
14	7
15	5
16	1
17	1
18	3
19	1
20	5
21	7
22	11
23	1
24	3
25	1
26	13
27	1
28	7
29	1
30	3
31	1
32	1
33	11
34	17
35	7
36	3
37	1
38	19
39	13
40	5
41	1
42	3
43	1
44	11
45	5
46	23
47	1
48	3
49	1
50	5
51	17
52	13
53	1
54	3
55	11
56	7
57	19
58	29
59	1
60	3
61	1
62	31
63	7
64	1
65	13
66	3
67	1
68	17
69	23
70	5
71	1
72	3
73	1
74	37
75	5
76	19
77	11
78	3
79	1
80	5
81	1
82	41
83	1
84	3
85	17
86	43
87	29
88	11
89	1
90	3
91	13
92	23

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	3
7	1
8	1
9	1
10	5
11	1
12	3
13	1
14	7
15	5
16	1
17	1
18	3
19	1
20	5
21	7
22	11
23	1
24	3
25	1
26	13
27	1
28	7
29	1
30	3
31	1
32	1
33	11
34	17
35	7
36	3
37	1
38	19
39	13
40	5
41	1
42	3
43	1
44	11
45	5
46	23
47	1
48	3
49	1
50	5
51	17
52	13
53	1
54	3
55	11
56	7
57	19
58	29
59	1
60	3
61	1
62	31
63	7
64	1
65	13
66	3
67	1
68	17
69	23
70	5
71	1
72	3
73	1
74	37
75	5
76	19
77	11
78	3
79	1
80	5
81	1
82	41
83	1
84	3
85	17
86	43
87	29
88	11
89	1
90	3
91	13
92	23

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	3
7	1
8	1
9	1
10	5
11	1
12	3
13	1
14	7
15	5
16	1
17	1
18	3
19	1
20	5
21	7
22	11
23	1
24	3
25	1
26	13
27	1
28	7
29	1
30	3
31	1
32	1
33	11
34	17
35	7
36	3
37	1
38	19
39	13
40	5
41	1
42	3
43	1
44	11
45	5
46	23
47	1
48	3
49	1
50	5
51	17
52	13
53	1
54	3
55	11
56	7
57	19
58	29
59	1
60	3
61	1
62	31
63	7
64	1
65	13
66	3
67	1
68	17
69	23
70	5
71	1
72	3
73	1
74	37
75	5
76	19
77	11
78	3
79	1
80	5
81	1
82	41
83	1
84	3
85	17
86	43
87	29
88	11
89	1
90	3
91	13
92	23