A137791 - cp's OEIS frontend

A137791 Number of ways to write n as sum of two positive numbers having no prime gaps in their factorization.

n	a(n)
1	0
2	1
3	1
4	2
5	2
6	3
7	3
8	4
9	4
10	5
11	4
12	5
13	5
14	6
15	5
16	6
17	6
18	7
19	7
20	8
21	7
22	7
23	6
24	8
25	7
26	8
27	7
28	8
29	7
30	9
31	9
32	10
33	9
34	10
35	9
36	11
37	9
38	11
39	9
40	10
41	9
42	11
43	10
44	10
45	8
46	10
47	10
48	13
49	11
50	12
51	9
52	11
53	10
54	14
55	11
56	12
57	8
58	10
59	10
60	14
61	12
62	13
63	9
64	12
65	12
66	14
67	11
68	12
69	8
70	11
71	10
72	16
73	12
74	11
75	10
76	14
77	14
78	16
79	14
80	14
81	9
82	13
83	14
84	18

[0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 4, 5, 5, 6, 5, 6, 6, 7, 7, 8, 7, 7, 6, 8, 7, 8, 7, 8, 7, 9, 9, 10, 9, 10, 9, 11, 9, 11, 9, 10, 9, 11, 10, 10, 8, 10, 10, 13, 11, 12, 9, 11, 10, 14, 11, 12, 8, 10, 10, 14, 12, 13, 9, 12, 12, 14, 11, 12, 8, 11, 10, 16, 12, 11, 10, 14, 14, 16, 14, 14, 9, 13, 14, 18]

cp's OEIS Frontend

A137791 Number of ways to write n as sum of two positive numbers having no prime gaps in their factorization.

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	2
5	2
6	3
7	3
8	4
9	4
10	5
11	4
12	5
13	5
14	6
15	5
16	6
17	6
18	7
19	7
20	8
21	7
22	7
23	6
24	8
25	7
26	8
27	7
28	8
29	7
30	9
31	9
32	10
33	9
34	10
35	9
36	11
37	9
38	11
39	9
40	10
41	9
42	11
43	10
44	10
45	8
46	10
47	10
48	13
49	11
50	12
51	9
52	11
53	10
54	14
55	11
56	12
57	8
58	10
59	10
60	14
61	12
62	13
63	9
64	12
65	12
66	14
67	11
68	12
69	8
70	11
71	10
72	16
73	12
74	11
75	10
76	14
77	14
78	16
79	14
80	14
81	9
82	13
83	14
84	18

n	a(n)
1	0
2	1
3	1
4	2
5	2
6	3
7	3
8	4
9	4
10	5
11	4
12	5
13	5
14	6
15	5
16	6
17	6
18	7
19	7
20	8
21	7
22	7
23	6
24	8
25	7
26	8
27	7
28	8
29	7
30	9
31	9
32	10
33	9
34	10
35	9
36	11
37	9
38	11
39	9
40	10
41	9
42	11
43	10
44	10
45	8
46	10
47	10
48	13
49	11
50	12
51	9
52	11
53	10
54	14
55	11
56	12
57	8
58	10
59	10
60	14
61	12
62	13
63	9
64	12
65	12
66	14
67	11
68	12
69	8
70	11
71	10
72	16
73	12
74	11
75	10
76	14
77	14
78	16
79	14
80	14
81	9
82	13
83	14
84	18

n	a(n)
1	0
2	1
3	1
4	2
5	2
6	3
7	3
8	4
9	4
10	5
11	4
12	5
13	5
14	6
15	5
16	6
17	6
18	7
19	7
20	8
21	7
22	7
23	6
24	8
25	7
26	8
27	7
28	8
29	7
30	9
31	9
32	10
33	9
34	10
35	9
36	11
37	9
38	11
39	9
40	10
41	9
42	11
43	10
44	10
45	8
46	10
47	10
48	13
49	11
50	12
51	9
52	11
53	10
54	14
55	11
56	12
57	8
58	10
59	10
60	14
61	12
62	13
63	9
64	12
65	12
66	14
67	11
68	12
69	8
70	11
71	10
72	16
73	12
74	11
75	10
76	14
77	14
78	16
79	14
80	14
81	9
82	13
83	14
84	18