A256555 - cp's OEIS frontend

A256555 Number of ways to write n as the sum of two (unordered) distinct elements of the set {floor(p/3): p is prime}.

n	a(n)
1	1
2	1
3	2
4	2
5	3
6	3
7	4
8	3
9	4
10	4
11	4
12	4
13	5
14	5
15	6
16	6
17	6
18	5
19	7
20	6
21	6
22	7
23	7
24	8
25	7
26	8
27	9
28	7
29	10
30	7
31	7
32	9
33	9
34	9
35	9
36	12
37	11
38	10
39	12
40	8
41	10
42	10
43	10
44	9
45	9
46	13
47	11
48	10
49	13
50	11
51	11
52	12
53	10
54	10
55	14
56	14
57	12
58	12
59	15
60	13
61	13
62	13
63	12
64	14
65	14
66	15
67	14
68	13
69	19
70	13
71	13
72	15
73	11
74	13
75	13
76	15
77	16
78	17
79	19
80	16
81	16
82	15
83	17
84	15
85	15
86	17
87	17
88	16
89	20
90	16
91	16
92	20
93	17
94	19
95	17
96	18
97	20
98	17
99	21
100	18

[1, 1, 2, 2, 3, 3, 4, 3, 4, 4, 4, 4, 5, 5, 6, 6, 6, 5, 7, 6, 6, 7, 7, 8, 7, 8, 9, 7, 10, 7, 7, 9, 9, 9, 9, 12, 11, 10, 12, 8, 10, 10, 10, 9, 9, 13, 11, 10, 13, 11, 11, 12, 10, 10, 14, 14, 12, 12, 15, 13, 13, 13, 12, 14, 14, 15, 14, 13, 19, 13, 13, 15, 11, 13, 13, 15, 16, 17, 19, 16, 16, 15, 17, 15, 15, 17, 17, 16, 20, 16, 16, 20, 17, 19, 17, 18, 20, 17, 21, 18]

cp's OEIS Frontend

A256555 Number of ways to write n as the sum of two (unordered) distinct elements of the set {floor(p/3): p is prime}.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	2
5	3
6	3
7	4
8	3
9	4
10	4
11	4
12	4
13	5
14	5
15	6
16	6
17	6
18	5
19	7
20	6
21	6
22	7
23	7
24	8
25	7
26	8
27	9
28	7
29	10
30	7
31	7
32	9
33	9
34	9
35	9
36	12
37	11
38	10
39	12
40	8
41	10
42	10
43	10
44	9
45	9
46	13
47	11
48	10
49	13
50	11
51	11
52	12
53	10
54	10
55	14
56	14
57	12
58	12
59	15
60	13
61	13
62	13
63	12
64	14
65	14
66	15
67	14
68	13
69	19
70	13
71	13
72	15
73	11
74	13
75	13
76	15
77	16
78	17
79	19
80	16
81	16
82	15
83	17
84	15
85	15
86	17
87	17
88	16
89	20
90	16
91	16
92	20
93	17
94	19
95	17
96	18
97	20
98	17
99	21
100	18

n	a(n)
1	1
2	1
3	2
4	2
5	3
6	3
7	4
8	3
9	4
10	4
11	4
12	4
13	5
14	5
15	6
16	6
17	6
18	5
19	7
20	6
21	6
22	7
23	7
24	8
25	7
26	8
27	9
28	7
29	10
30	7
31	7
32	9
33	9
34	9
35	9
36	12
37	11
38	10
39	12
40	8
41	10
42	10
43	10
44	9
45	9
46	13
47	11
48	10
49	13
50	11
51	11
52	12
53	10
54	10
55	14
56	14
57	12
58	12
59	15
60	13
61	13
62	13
63	12
64	14
65	14
66	15
67	14
68	13
69	19
70	13
71	13
72	15
73	11
74	13
75	13
76	15
77	16
78	17
79	19
80	16
81	16
82	15
83	17
84	15
85	15
86	17
87	17
88	16
89	20
90	16
91	16
92	20
93	17
94	19
95	17
96	18
97	20
98	17
99	21
100	18

n	a(n)
1	1
2	1
3	2
4	2
5	3
6	3
7	4
8	3
9	4
10	4
11	4
12	4
13	5
14	5
15	6
16	6
17	6
18	5
19	7
20	6
21	6
22	7
23	7
24	8
25	7
26	8
27	9
28	7
29	10
30	7
31	7
32	9
33	9
34	9
35	9
36	12
37	11
38	10
39	12
40	8
41	10
42	10
43	10
44	9
45	9
46	13
47	11
48	10
49	13
50	11
51	11
52	12
53	10
54	10
55	14
56	14
57	12
58	12
59	15
60	13
61	13
62	13
63	12
64	14
65	14
66	15
67	14
68	13
69	19
70	13
71	13
72	15
73	11
74	13
75	13
76	15
77	16
78	17
79	19
80	16
81	16
82	15
83	17
84	15
85	15
86	17
87	17
88	16
89	20
90	16
91	16
92	20
93	17
94	19
95	17
96	18
97	20
98	17
99	21
100	18