A316290 - cp's OEIS frontend

A316290 a(n) is the number of ways of writing prime(n) as the sum of a prime number and a number that has only prime factors 2 and/or 5.

n	a(n)
1	0
2	1
3	1
4	3
5	2
6	3
7	2
8	3
9	4
10	2
11	3
12	3
13	2
14	4
15	4
16	4
17	2
18	5
19	4
20	4
21	4
22	4
23	6
24	2
25	3
26	3
27	6
28	5
29	5
30	5
31	3
32	4
33	4
34	6
35	2
36	5
37	4
38	4
39	7
40	5
41	4
42	6
43	4
44	3
45	5
46	6
47	5
48	3
49	5
50	6
51	4
52	5
53	5
54	3
55	5
56	6
57	4
58	6
59	5
60	5
61	5
62	6
63	4
64	5
65	6
66	6
67	5
68	4
69	5
70	5
71	6
72	4
73	6
74	4
75	5
76	6
77	5
78	5
79	4
80	5
81	4
82	5
83	6
84	6
85	6
86	6
87	6

[0, 1, 1, 3, 2, 3, 2, 3, 4, 2, 3, 3, 2, 4, 4, 4, 2, 5, 4, 4, 4, 4, 6, 2, 3, 3, 6, 5, 5, 5, 3, 4, 4, 6, 2, 5, 4, 4, 7, 5, 4, 6, 4, 3, 5, 6, 5, 3, 5, 6, 4, 5, 5, 3, 5, 6, 4, 6, 5, 5, 5, 6, 4, 5, 6, 6, 5, 4, 5, 5, 6, 4, 6, 4, 5, 6, 5, 5, 4, 5, 4, 5, 6, 6, 6, 6, 6]

cp's OEIS Frontend

A316290 a(n) is the number of ways of writing prime(n) as the sum of a prime number and a number that has only prime factors 2 and/or 5.

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	3
5	2
6	3
7	2
8	3
9	4
10	2
11	3
12	3
13	2
14	4
15	4
16	4
17	2
18	5
19	4
20	4
21	4
22	4
23	6
24	2
25	3
26	3
27	6
28	5
29	5
30	5
31	3
32	4
33	4
34	6
35	2
36	5
37	4
38	4
39	7
40	5
41	4
42	6
43	4
44	3
45	5
46	6
47	5
48	3
49	5
50	6
51	4
52	5
53	5
54	3
55	5
56	6
57	4
58	6
59	5
60	5
61	5
62	6
63	4
64	5
65	6
66	6
67	5
68	4
69	5
70	5
71	6
72	4
73	6
74	4
75	5
76	6
77	5
78	5
79	4
80	5
81	4
82	5
83	6
84	6
85	6
86	6
87	6

n	a(n)
1	0
2	1
3	1
4	3
5	2
6	3
7	2
8	3
9	4
10	2
11	3
12	3
13	2
14	4
15	4
16	4
17	2
18	5
19	4
20	4
21	4
22	4
23	6
24	2
25	3
26	3
27	6
28	5
29	5
30	5
31	3
32	4
33	4
34	6
35	2
36	5
37	4
38	4
39	7
40	5
41	4
42	6
43	4
44	3
45	5
46	6
47	5
48	3
49	5
50	6
51	4
52	5
53	5
54	3
55	5
56	6
57	4
58	6
59	5
60	5
61	5
62	6
63	4
64	5
65	6
66	6
67	5
68	4
69	5
70	5
71	6
72	4
73	6
74	4
75	5
76	6
77	5
78	5
79	4
80	5
81	4
82	5
83	6
84	6
85	6
86	6
87	6

n	a(n)
1	0
2	1
3	1
4	3
5	2
6	3
7	2
8	3
9	4
10	2
11	3
12	3
13	2
14	4
15	4
16	4
17	2
18	5
19	4
20	4
21	4
22	4
23	6
24	2
25	3
26	3
27	6
28	5
29	5
30	5
31	3
32	4
33	4
34	6
35	2
36	5
37	4
38	4
39	7
40	5
41	4
42	6
43	4
44	3
45	5
46	6
47	5
48	3
49	5
50	6
51	4
52	5
53	5
54	3
55	5
56	6
57	4
58	6
59	5
60	5
61	5
62	6
63	4
64	5
65	6
66	6
67	5
68	4
69	5
70	5
71	6
72	4
73	6
74	4
75	5
76	6
77	5
78	5
79	4
80	5
81	4
82	5
83	6
84	6
85	6
86	6
87	6