A137722 - cp's OEIS frontend

A137722 Number of numbers not greater than n with exactly one prime gap in their factorization.

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	1
11	1
12	1
13	1
14	2
15	2
16	2
17	2
18	2
19	2
20	3
21	4
22	5
23	5
24	5
25	5
26	6
27	6
28	7
29	7
30	7
31	7
32	7
33	8
34	9
35	9
36	9
37	9
38	10
39	11
40	12
41	12
42	13
43	13
44	14
45	14
46	15
47	15
48	15
49	15
50	16
51	17
52	18
53	18
54	18
55	19
56	20
57	21
58	22
59	22
60	22
61	22
62	23
63	24
64	24
65	25
66	26
67	26
68	27
69	28
70	29
71	29
72	29
73	29
74	30
75	30
76	31
77	31
78	32
79	32
80	33
81	33
82	34

[0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3, 4, 5, 5, 5, 5, 6, 6, 7, 7, 7, 7, 7, 8, 9, 9, 9, 9, 10, 11, 12, 12, 13, 13, 14, 14, 15, 15, 15, 15, 16, 17, 18, 18, 18, 19, 20, 21, 22, 22, 22, 22, 23, 24, 24, 25, 26, 26, 27, 28, 29, 29, 29, 29, 30, 30, 31, 31, 32, 32, 33, 33, 34]

cp's OEIS Frontend

A137722 Number of numbers not greater than n with exactly one prime gap in their factorization.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	1
11	1
12	1
13	1
14	2
15	2
16	2
17	2
18	2
19	2
20	3
21	4
22	5
23	5
24	5
25	5
26	6
27	6
28	7
29	7
30	7
31	7
32	7
33	8
34	9
35	9
36	9
37	9
38	10
39	11
40	12
41	12
42	13
43	13
44	14
45	14
46	15
47	15
48	15
49	15
50	16
51	17
52	18
53	18
54	18
55	19
56	20
57	21
58	22
59	22
60	22
61	22
62	23
63	24
64	24
65	25
66	26
67	26
68	27
69	28
70	29
71	29
72	29
73	29
74	30
75	30
76	31
77	31
78	32
79	32
80	33
81	33
82	34

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	1
11	1
12	1
13	1
14	2
15	2
16	2
17	2
18	2
19	2
20	3
21	4
22	5
23	5
24	5
25	5
26	6
27	6
28	7
29	7
30	7
31	7
32	7
33	8
34	9
35	9
36	9
37	9
38	10
39	11
40	12
41	12
42	13
43	13
44	14
45	14
46	15
47	15
48	15
49	15
50	16
51	17
52	18
53	18
54	18
55	19
56	20
57	21
58	22
59	22
60	22
61	22
62	23
63	24
64	24
65	25
66	26
67	26
68	27
69	28
70	29
71	29
72	29
73	29
74	30
75	30
76	31
77	31
78	32
79	32
80	33
81	33
82	34

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	1
11	1
12	1
13	1
14	2
15	2
16	2
17	2
18	2
19	2
20	3
21	4
22	5
23	5
24	5
25	5
26	6
27	6
28	7
29	7
30	7
31	7
32	7
33	8
34	9
35	9
36	9
37	9
38	10
39	11
40	12
41	12
42	13
43	13
44	14
45	14
46	15
47	15
48	15
49	15
50	16
51	17
52	18
53	18
54	18
55	19
56	20
57	21
58	22
59	22
60	22
61	22
62	23
63	24
64	24
65	25
66	26
67	26
68	27
69	28
70	29
71	29
72	29
73	29
74	30
75	30
76	31
77	31
78	32
79	32
80	33
81	33
82	34