A307908 - cp's OEIS frontend

A307908 a(n) is the least k such that p^k >= n for any prime factor p of n.

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

[1, 1, 2, 1, 3, 1, 3, 2, 4, 1, 4, 1, 4, 3, 4, 1, 5, 1, 5, 3, 5, 1, 5, 2, 5, 3, 5, 1, 5, 1, 5, 4, 6, 3, 6, 1, 6, 4, 6, 1, 6, 1, 6, 4, 6, 1, 6, 2, 6, 4, 6, 1, 6, 3, 6, 4, 6, 1, 6, 1, 6, 4, 6, 3, 7, 1, 7, 4, 7, 1, 7, 1, 7, 4, 7, 3, 7, 1, 7, 4, 7, 1, 7, 3, 7, 5, 7]

cp's OEIS Frontend

A307908 a(n) is the least k such that p^k >= n for any prime factor p of n.

Table of values

List of values

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

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

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