A334072 - cp's OEIS frontend

A334072 Decimal expansion of Sum_{k >= 1} 2^(-sigma(k)), where sigma is the sum of divisors function (A000203).

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

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

cp's OEIS Frontend

A334072 Decimal expansion of Sum_{k >= 1} 2^(-sigma(k)), where sigma is the sum of divisors function (A000203).

Table of values

List of values

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

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

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