A088740 - cp's OEIS frontend

A088740 Greatest semiprime divisor of n-th composite number.

n	a(n)
1	4
2	6
3	4
4	9
5	10
6	6
7	14
8	15
9	4
10	9
11	10
12	21
13	22
14	6
15	25
16	26
17	9
18	14
19	15
20	4
21	33
22	34
23	35
24	9
25	38
26	39
27	10
28	21
29	22
30	15
31	46
32	6
33	49
34	25
35	51
36	26
37	9
38	55
39	14
40	57
41	58
42	15
43	62
44	21
45	4
46	65
47	33
48	34
49	69
50	35
51	9
52	74
53	25
54	38
55	77
56	39
57	10
58	9
59	82
60	21
61	85
62	86
63	87
64	22
65	15
66	91
67	46
68	93
69	94
70	95
71	6
72	49
73	33
74	25

[4, 6, 4, 9, 10, 6, 14, 15, 4, 9, 10, 21, 22, 6, 25, 26, 9, 14, 15, 4, 33, 34, 35, 9, 38, 39, 10, 21, 22, 15, 46, 6, 49, 25, 51, 26, 9, 55, 14, 57, 58, 15, 62, 21, 4, 65, 33, 34, 69, 35, 9, 74, 25, 38, 77, 39, 10, 9, 82, 21, 85, 86, 87, 22, 15, 91, 46, 93, 94, 95, 6, 49, 33, 25]

cp's OEIS Frontend

A088740 Greatest semiprime divisor of n-th composite number.

Table of values

List of values

n	a(n)
1	4
2	6
3	4
4	9
5	10
6	6
7	14
8	15
9	4
10	9
11	10
12	21
13	22
14	6
15	25
16	26
17	9
18	14
19	15
20	4
21	33
22	34
23	35
24	9
25	38
26	39
27	10
28	21
29	22
30	15
31	46
32	6
33	49
34	25
35	51
36	26
37	9
38	55
39	14
40	57
41	58
42	15
43	62
44	21
45	4
46	65
47	33
48	34
49	69
50	35
51	9
52	74
53	25
54	38
55	77
56	39
57	10
58	9
59	82
60	21
61	85
62	86
63	87
64	22
65	15
66	91
67	46
68	93
69	94
70	95
71	6
72	49
73	33
74	25

n	a(n)
1	4
2	6
3	4
4	9
5	10
6	6
7	14
8	15
9	4
10	9
11	10
12	21
13	22
14	6
15	25
16	26
17	9
18	14
19	15
20	4
21	33
22	34
23	35
24	9
25	38
26	39
27	10
28	21
29	22
30	15
31	46
32	6
33	49
34	25
35	51
36	26
37	9
38	55
39	14
40	57
41	58
42	15
43	62
44	21
45	4
46	65
47	33
48	34
49	69
50	35
51	9
52	74
53	25
54	38
55	77
56	39
57	10
58	9
59	82
60	21
61	85
62	86
63	87
64	22
65	15
66	91
67	46
68	93
69	94
70	95
71	6
72	49
73	33
74	25

n	a(n)
1	4
2	6
3	4
4	9
5	10
6	6
7	14
8	15
9	4
10	9
11	10
12	21
13	22
14	6
15	25
16	26
17	9
18	14
19	15
20	4
21	33
22	34
23	35
24	9
25	38
26	39
27	10
28	21
29	22
30	15
31	46
32	6
33	49
34	25
35	51
36	26
37	9
38	55
39	14
40	57
41	58
42	15
43	62
44	21
45	4
46	65
47	33
48	34
49	69
50	35
51	9
52	74
53	25
54	38
55	77
56	39
57	10
58	9
59	82
60	21
61	85
62	86
63	87
64	22
65	15
66	91
67	46
68	93
69	94
70	95
71	6
72	49
73	33
74	25