A307379 - cp's OEIS frontend

A307379 Decimal expansion of Sum_{n >= 1} 2/(k(n)*(k(n) + 1)), with k = A018252 (nonprime numbers).

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

[1, 3, 3, 9, 5, 4, 0, 1, 4, 7, 4, 7, 1, 5, 9, 3, 5, 1, 7, 9, 6, 9, 8, 1, 0, 8, 2, 3, 8, 2, 6, 5, 1, 0, 4, 7, 8, 7, 1, 1, 4, 8, 1, 1, 6, 1, 0, 5, 1, 8, 5, 9, 0, 8, 7, 6, 9, 9, 5, 4, 2, 7, 9, 8, 4, 7, 5, 1, 5, 5, 6, 6, 6, 4, 1, 4, 1, 8, 4, 1, 1, 1, 3, 5, 6, 5, 9]

cp's OEIS Frontend

A307379 Decimal expansion of Sum_{n >= 1} 2/(k(n)*(k(n) + 1)), with k = A018252 (nonprime numbers).

Table of values

List of values

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

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

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