A331134 - cp's OEIS frontend

A331134 a(n) = Sum_{primes p <= n} r_2(p)/4, where r_2(n) = A004018(n).

n	a(n)
1	0
2	1
3	1
4	1
5	3
6	3
7	3
8	3
9	3
10	3
11	3
12	3
13	5
14	5
15	5
16	5
17	7
18	7
19	7
20	7
21	7
22	7
23	7
24	7
25	7
26	7
27	7
28	7
29	9
30	9
31	9
32	9
33	9
34	9
35	9
36	9
37	11
38	11
39	11
40	11
41	13
42	13
43	13
44	13
45	13
46	13
47	13
48	13
49	13
50	13
51	13
52	13
53	15
54	15
55	15
56	15
57	15
58	15
59	15
60	15
61	17
62	17
63	17
64	17
65	17
66	17
67	17
68	17
69	17
70	17
71	17
72	17
73	19
74	19
75	19
76	19
77	19
78	19
79	19
80	19
81	19
82	19
83	19
84	19
85	19
86	19
87	19
88	19
89	21

[0, 1, 1, 1, 3, 3, 3, 3, 3, 3, 3, 3, 5, 5, 5, 5, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 9, 9, 9, 9, 9, 9, 9, 9, 11, 11, 11, 11, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 15, 15, 15, 15, 15, 15, 15, 15, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 21]

cp's OEIS Frontend

A331134 a(n) = Sum_{primes p <= n} r_2(p)/4, where r_2(n) = A004018(n).

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	1
5	3
6	3
7	3
8	3
9	3
10	3
11	3
12	3
13	5
14	5
15	5
16	5
17	7
18	7
19	7
20	7
21	7
22	7
23	7
24	7
25	7
26	7
27	7
28	7
29	9
30	9
31	9
32	9
33	9
34	9
35	9
36	9
37	11
38	11
39	11
40	11
41	13
42	13
43	13
44	13
45	13
46	13
47	13
48	13
49	13
50	13
51	13
52	13
53	15
54	15
55	15
56	15
57	15
58	15
59	15
60	15
61	17
62	17
63	17
64	17
65	17
66	17
67	17
68	17
69	17
70	17
71	17
72	17
73	19
74	19
75	19
76	19
77	19
78	19
79	19
80	19
81	19
82	19
83	19
84	19
85	19
86	19
87	19
88	19
89	21

n	a(n)
1	0
2	1
3	1
4	1
5	3
6	3
7	3
8	3
9	3
10	3
11	3
12	3
13	5
14	5
15	5
16	5
17	7
18	7
19	7
20	7
21	7
22	7
23	7
24	7
25	7
26	7
27	7
28	7
29	9
30	9
31	9
32	9
33	9
34	9
35	9
36	9
37	11
38	11
39	11
40	11
41	13
42	13
43	13
44	13
45	13
46	13
47	13
48	13
49	13
50	13
51	13
52	13
53	15
54	15
55	15
56	15
57	15
58	15
59	15
60	15
61	17
62	17
63	17
64	17
65	17
66	17
67	17
68	17
69	17
70	17
71	17
72	17
73	19
74	19
75	19
76	19
77	19
78	19
79	19
80	19
81	19
82	19
83	19
84	19
85	19
86	19
87	19
88	19
89	21

n	a(n)
1	0
2	1
3	1
4	1
5	3
6	3
7	3
8	3
9	3
10	3
11	3
12	3
13	5
14	5
15	5
16	5
17	7
18	7
19	7
20	7
21	7
22	7
23	7
24	7
25	7
26	7
27	7
28	7
29	9
30	9
31	9
32	9
33	9
34	9
35	9
36	9
37	11
38	11
39	11
40	11
41	13
42	13
43	13
44	13
45	13
46	13
47	13
48	13
49	13
50	13
51	13
52	13
53	15
54	15
55	15
56	15
57	15
58	15
59	15
60	15
61	17
62	17
63	17
64	17
65	17
66	17
67	17
68	17
69	17
70	17
71	17
72	17
73	19
74	19
75	19
76	19
77	19
78	19
79	19
80	19
81	19
82	19
83	19
84	19
85	19
86	19
87	19
88	19
89	21