A366649 - cp's OEIS frontend

A366649 Largest prime power (including 1) proper divisor of n, for n >= 2; a(1) = 1.

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

[1, 1, 1, 2, 1, 3, 1, 4, 3, 5, 1, 4, 1, 7, 5, 8, 1, 9, 1, 5, 7, 11, 1, 8, 5, 13, 9, 7, 1, 5, 1, 16, 11, 17, 7, 9, 1, 19, 13, 8, 1, 7, 1, 11, 9, 23, 1, 16, 7, 25, 17, 13, 1, 27, 11, 8, 19, 29, 1, 5, 1, 31, 9, 32, 13, 11, 1, 17, 23, 7, 1, 9, 1, 37, 25, 19, 11, 13, 1, 16, 27, 41, 1, 7, 17]

cp's OEIS Frontend

A366649 Largest prime power (including 1) proper divisor of n, for n >= 2; a(1) = 1.

Table of values

List of values

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

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

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