A066766 - cp's OEIS frontend

A066766 Decimal expansion of Sum_{k>=1} sigma(k)/2^k where sigma(k) is the sum of divisors of k, 1 <= d <= k.

n	a(n)
1	2
2	7
3	4
4	4
5	0
6	3
7	3
8	8
9	8
10	8
11	7
12	5
13	9
14	4
15	8
16	8
17	3
18	6
19	0
20	4
21	8
22	0
23	2
24	1
25	4
26	8
27	9
28	1
29	4
30	9
31	2
32	2
33	7
34	2
35	1
36	6
37	4
38	3
39	1
40	1
41	4
42	2
43	8
44	9
45	8
46	1
47	3
48	1
49	9
50	6
51	3
52	9
53	3
54	1
55	7
56	8
57	4
58	8
59	5
60	2
61	8
62	8
63	8
64	4
65	7
66	3
67	7
68	9
69	1
70	2
71	2
72	8
73	3
74	2
75	6
76	3
77	8
78	9
79	5
80	6
81	8
82	8
83	5
84	6
85	6
86	2
87	5
88	2
89	3
90	1
91	0
92	7
93	1
94	2
95	5
96	0
97	6
98	8
99	8
100	7
101	7
102	3
103	7
104	4
105	0

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

cp's OEIS Frontend

A066766 Decimal expansion of Sum_{k>=1} sigma(k)/2^k where sigma(k) is the sum of divisors of k, 1 <= d <= k.

Table of values

List of values

n	a(n)
1	2
2	7
3	4
4	4
5	0
6	3
7	3
8	8
9	8
10	8
11	7
12	5
13	9
14	4
15	8
16	8
17	3
18	6
19	0
20	4
21	8
22	0
23	2
24	1
25	4
26	8
27	9
28	1
29	4
30	9
31	2
32	2
33	7
34	2
35	1
36	6
37	4
38	3
39	1
40	1
41	4
42	2
43	8
44	9
45	8
46	1
47	3
48	1
49	9
50	6
51	3
52	9
53	3
54	1
55	7
56	8
57	4
58	8
59	5
60	2
61	8
62	8
63	8
64	4
65	7
66	3
67	7
68	9
69	1
70	2
71	2
72	8
73	3
74	2
75	6
76	3
77	8
78	9
79	5
80	6
81	8
82	8
83	5
84	6
85	6
86	2
87	5
88	2
89	3
90	1
91	0
92	7
93	1
94	2
95	5
96	0
97	6
98	8
99	8
100	7
101	7
102	3
103	7
104	4
105	0

n	a(n)
1	2
2	7
3	4
4	4
5	0
6	3
7	3
8	8
9	8
10	8
11	7
12	5
13	9
14	4
15	8
16	8
17	3
18	6
19	0
20	4
21	8
22	0
23	2
24	1
25	4
26	8
27	9
28	1
29	4
30	9
31	2
32	2
33	7
34	2
35	1
36	6
37	4
38	3
39	1
40	1
41	4
42	2
43	8
44	9
45	8
46	1
47	3
48	1
49	9
50	6
51	3
52	9
53	3
54	1
55	7
56	8
57	4
58	8
59	5
60	2
61	8
62	8
63	8
64	4
65	7
66	3
67	7
68	9
69	1
70	2
71	2
72	8
73	3
74	2
75	6
76	3
77	8
78	9
79	5
80	6
81	8
82	8
83	5
84	6
85	6
86	2
87	5
88	2
89	3
90	1
91	0
92	7
93	1
94	2
95	5
96	0
97	6
98	8
99	8
100	7
101	7
102	3
103	7
104	4
105	0

n	a(n)
1	2
2	7
3	4
4	4
5	0
6	3
7	3
8	8
9	8
10	8
11	7
12	5
13	9
14	4
15	8
16	8
17	3
18	6
19	0
20	4
21	8
22	0
23	2
24	1
25	4
26	8
27	9
28	1
29	4
30	9
31	2
32	2
33	7
34	2
35	1
36	6
37	4
38	3
39	1
40	1
41	4
42	2
43	8
44	9
45	8
46	1
47	3
48	1
49	9
50	6
51	3
52	9
53	3
54	1
55	7
56	8
57	4
58	8
59	5
60	2
61	8
62	8
63	8
64	4
65	7
66	3
67	7
68	9
69	1
70	2
71	2
72	8
73	3
74	2
75	6
76	3
77	8
78	9
79	5
80	6
81	8
82	8
83	5
84	6
85	6
86	2
87	5
88	2
89	3
90	1
91	0
92	7
93	1
94	2
95	5
96	0
97	6
98	8
99	8
100	7
101	7
102	3
103	7
104	4
105	0