A179939 - cp's OEIS frontend

A179939 Largest semiprime divisor of all composite numbers between semiprime(n) and semiprime(n+1), or 0 if there are none.

n	a(n)
1	0
2	4
3	0
4	6
5	0
6	10
7	0
8	6
9	0
10	15
11	0
12	0
13	9
14	0
15	22
16	6
17	25
18	26
19	14
20	0
21	15
22	21
23	34
24	35
25	38
26	39
27	21
28	0
29	0
30	22
31	46
32	0
33	0
34	51
35	55
36	57
37	58
38	0
39	15
40	0
41	0
42	62
43	65
44	0
45	69
46	0
47	0
48	9
49	0
50	77
51	39
52	0
53	10
54	82
55	21
56	87
57	0
58	91
59	46
60	93
61	95
62	65
63	0
64	0
65	51
66	0
67	69
68	106

[0, 4, 0, 6, 0, 10, 0, 6, 0, 15, 0, 0, 9, 0, 22, 6, 25, 26, 14, 0, 15, 21, 34, 35, 38, 39, 21, 0, 0, 22, 46, 0, 0, 51, 55, 57, 58, 0, 15, 0, 0, 62, 65, 0, 69, 0, 0, 9, 0, 77, 39, 0, 10, 82, 21, 87, 0, 91, 46, 93, 95, 65, 0, 0, 51, 0, 69, 106]

cp's OEIS Frontend

A179939 Largest semiprime divisor of all composite numbers between semiprime(n) and semiprime(n+1), or 0 if there are none.

Table of values

List of values

n	a(n)
1	0
2	4
3	0
4	6
5	0
6	10
7	0
8	6
9	0
10	15
11	0
12	0
13	9
14	0
15	22
16	6
17	25
18	26
19	14
20	0
21	15
22	21
23	34
24	35
25	38
26	39
27	21
28	0
29	0
30	22
31	46
32	0
33	0
34	51
35	55
36	57
37	58
38	0
39	15
40	0
41	0
42	62
43	65
44	0
45	69
46	0
47	0
48	9
49	0
50	77
51	39
52	0
53	10
54	82
55	21
56	87
57	0
58	91
59	46
60	93
61	95
62	65
63	0
64	0
65	51
66	0
67	69
68	106

n	a(n)
1	0
2	4
3	0
4	6
5	0
6	10
7	0
8	6
9	0
10	15
11	0
12	0
13	9
14	0
15	22
16	6
17	25
18	26
19	14
20	0
21	15
22	21
23	34
24	35
25	38
26	39
27	21
28	0
29	0
30	22
31	46
32	0
33	0
34	51
35	55
36	57
37	58
38	0
39	15
40	0
41	0
42	62
43	65
44	0
45	69
46	0
47	0
48	9
49	0
50	77
51	39
52	0
53	10
54	82
55	21
56	87
57	0
58	91
59	46
60	93
61	95
62	65
63	0
64	0
65	51
66	0
67	69
68	106

n	a(n)
1	0
2	4
3	0
4	6
5	0
6	10
7	0
8	6
9	0
10	15
11	0
12	0
13	9
14	0
15	22
16	6
17	25
18	26
19	14
20	0
21	15
22	21
23	34
24	35
25	38
26	39
27	21
28	0
29	0
30	22
31	46
32	0
33	0
34	51
35	55
36	57
37	58
38	0
39	15
40	0
41	0
42	62
43	65
44	0
45	69
46	0
47	0
48	9
49	0
50	77
51	39
52	0
53	10
54	82
55	21
56	87
57	0
58	91
59	46
60	93
61	95
62	65
63	0
64	0
65	51
66	0
67	69
68	106