A370834 - cp's OEIS frontend

A370834 a(n) is the greatest prime dividing the n-th powerful number, for n >= 2; a(1)=1.

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

[1, 2, 2, 3, 2, 5, 3, 2, 3, 7, 2, 3, 3, 5, 3, 11, 5, 2, 3, 13, 7, 5, 3, 5, 3, 2, 3, 17, 3, 7, 19, 7, 5, 3, 7, 11, 5, 2, 23, 3, 5, 3, 5, 13, 3, 7, 5, 29, 3, 5, 31, 11, 3, 5, 2, 11, 5, 3, 17, 7, 3, 7, 11, 13, 37, 7, 19, 13, 7, 5, 41, 3, 7, 5, 43, 11, 3, 5, 5, 2, 23]

cp's OEIS Frontend

A370834 a(n) is the greatest prime dividing the n-th powerful number, for n >= 2; a(1)=1.

Table of values

List of values

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

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

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