A360329 - cp's OEIS frontend

A360329 a(n) is the largest divisor of n that has only prime factors that are not prime-indexed primes.

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

[1, 2, 1, 4, 1, 2, 7, 8, 1, 2, 1, 4, 13, 14, 1, 16, 1, 2, 19, 4, 7, 2, 23, 8, 1, 26, 1, 28, 29, 2, 1, 32, 1, 2, 7, 4, 37, 38, 13, 8, 1, 14, 43, 4, 1, 46, 47, 16, 49, 2, 1, 52, 53, 2, 1, 56, 19, 58, 1, 4, 61, 2, 7, 64, 13, 2, 1, 4, 23, 14, 71, 8, 73, 74, 1, 76, 7]

cp's OEIS Frontend

A360329 a(n) is the largest divisor of n that has only prime factors that are not prime-indexed primes.

Table of values

List of values

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

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

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