A331135 - cp's OEIS frontend

A331135 a(n) = Sum_{primes p <= n} r_2(p-1)/4, where r_2(n) = A004018(n).

n	a(n)
1	0
2	1
3	2
4	2
5	3
6	3
7	3
8	3
9	3
10	3
11	5
12	5
13	5
14	5
15	5
16	5
17	6
18	6
19	7
20	7
21	7
22	7
23	7
24	7
25	7
26	7
27	7
28	7
29	7
30	7
31	7
32	7
33	7
34	7
35	7
36	7
37	8
38	8
39	8
40	8
41	10
42	10
43	10
44	10
45	10
46	10
47	10
48	10
49	10
50	10
51	10
52	10
53	12
54	12
55	12
56	12
57	12
58	12
59	14
60	14
61	14
62	14
63	14
64	14
65	14
66	14
67	14
68	14
69	14
70	14
71	14
72	14
73	15
74	15
75	15
76	15
77	15
78	15
79	15
80	15
81	15
82	15
83	17
84	17
85	17
86	17
87	17
88	17
89	17
90	17

[0, 1, 2, 2, 3, 3, 3, 3, 3, 3, 5, 5, 5, 5, 5, 5, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 12, 12, 12, 12, 12, 12, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 17, 17, 17, 17, 17, 17, 17, 17]

cp's OEIS Frontend

A331135 a(n) = Sum_{primes p <= n} r_2(p-1)/4, where r_2(n) = A004018(n).

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	2
5	3
6	3
7	3
8	3
9	3
10	3
11	5
12	5
13	5
14	5
15	5
16	5
17	6
18	6
19	7
20	7
21	7
22	7
23	7
24	7
25	7
26	7
27	7
28	7
29	7
30	7
31	7
32	7
33	7
34	7
35	7
36	7
37	8
38	8
39	8
40	8
41	10
42	10
43	10
44	10
45	10
46	10
47	10
48	10
49	10
50	10
51	10
52	10
53	12
54	12
55	12
56	12
57	12
58	12
59	14
60	14
61	14
62	14
63	14
64	14
65	14
66	14
67	14
68	14
69	14
70	14
71	14
72	14
73	15
74	15
75	15
76	15
77	15
78	15
79	15
80	15
81	15
82	15
83	17
84	17
85	17
86	17
87	17
88	17
89	17
90	17

n	a(n)
1	0
2	1
3	2
4	2
5	3
6	3
7	3
8	3
9	3
10	3
11	5
12	5
13	5
14	5
15	5
16	5
17	6
18	6
19	7
20	7
21	7
22	7
23	7
24	7
25	7
26	7
27	7
28	7
29	7
30	7
31	7
32	7
33	7
34	7
35	7
36	7
37	8
38	8
39	8
40	8
41	10
42	10
43	10
44	10
45	10
46	10
47	10
48	10
49	10
50	10
51	10
52	10
53	12
54	12
55	12
56	12
57	12
58	12
59	14
60	14
61	14
62	14
63	14
64	14
65	14
66	14
67	14
68	14
69	14
70	14
71	14
72	14
73	15
74	15
75	15
76	15
77	15
78	15
79	15
80	15
81	15
82	15
83	17
84	17
85	17
86	17
87	17
88	17
89	17
90	17

n	a(n)
1	0
2	1
3	2
4	2
5	3
6	3
7	3
8	3
9	3
10	3
11	5
12	5
13	5
14	5
15	5
16	5
17	6
18	6
19	7
20	7
21	7
22	7
23	7
24	7
25	7
26	7
27	7
28	7
29	7
30	7
31	7
32	7
33	7
34	7
35	7
36	7
37	8
38	8
39	8
40	8
41	10
42	10
43	10
44	10
45	10
46	10
47	10
48	10
49	10
50	10
51	10
52	10
53	12
54	12
55	12
56	12
57	12
58	12
59	14
60	14
61	14
62	14
63	14
64	14
65	14
66	14
67	14
68	14
69	14
70	14
71	14
72	14
73	15
74	15
75	15
76	15
77	15
78	15
79	15
80	15
81	15
82	15
83	17
84	17
85	17
86	17
87	17
88	17
89	17
90	17