A190405 - cp's OEIS frontend

A190405 Decimal expansion of Sum_{k>=1} (1/2)^T(k), where T=A000217 (triangular numbers); based on column 1 of the natural number array, A000027.

n	a(n)
0	6
1	4
2	1
3	6
4	3
5	2
6	5
7	6
8	0
9	6
10	5
11	5
12	1
13	5
14	3
15	8
16	6
17	6
18	2
19	9
20	3
21	8
22	4
23	2
24	7
25	7
26	0
27	2
28	2
29	5
30	4
31	2
32	9
33	4
34	3
35	4
36	2
37	2
38	6
39	0
40	6
41	1
42	5
43	3
44	7
45	9
46	5
47	6
48	7
49	3
50	9
51	7
52	4
53	7
54	8
55	0
56	4
57	6
58	5
59	1
60	6
61	2
62	2
63	3
64	8
65	0
66	1
67	4
68	4
69	6
70	0
71	3
72	7
73	3
74	3
75	3
76	5
77	1
78	7
79	7
80	5
81	6
82	0
83	0
84	3
85	6
86	4
87	1
88	7
89	1
90	6
91	2
92	3
93	3
94	5
95	9
96	1
97	3
98	3
99	0
100	8
101	6
102	0
103	8
104	9
105	7
106	3
107	5
108	3
109	1
110	6
111	3
112	4
113	3
114	6
115	1
116	9
117	4
118	6
119	1

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

cp's OEIS Frontend

A190405 Decimal expansion of Sum_{k>=1} (1/2)^T(k), where T=A000217 (triangular numbers); based on column 1 of the natural number array, A000027.

Table of values

List of values

n	a(n)
0	6
1	4
2	1
3	6
4	3
5	2
6	5
7	6
8	0
9	6
10	5
11	5
12	1
13	5
14	3
15	8
16	6
17	6
18	2
19	9
20	3
21	8
22	4
23	2
24	7
25	7
26	0
27	2
28	2
29	5
30	4
31	2
32	9
33	4
34	3
35	4
36	2
37	2
38	6
39	0
40	6
41	1
42	5
43	3
44	7
45	9
46	5
47	6
48	7
49	3
50	9
51	7
52	4
53	7
54	8
55	0
56	4
57	6
58	5
59	1
60	6
61	2
62	2
63	3
64	8
65	0
66	1
67	4
68	4
69	6
70	0
71	3
72	7
73	3
74	3
75	3
76	5
77	1
78	7
79	7
80	5
81	6
82	0
83	0
84	3
85	6
86	4
87	1
88	7
89	1
90	6
91	2
92	3
93	3
94	5
95	9
96	1
97	3
98	3
99	0
100	8
101	6
102	0
103	8
104	9
105	7
106	3
107	5
108	3
109	1
110	6
111	3
112	4
113	3
114	6
115	1
116	9
117	4
118	6
119	1

n	a(n)
0	6
1	4
2	1
3	6
4	3
5	2
6	5
7	6
8	0
9	6
10	5
11	5
12	1
13	5
14	3
15	8
16	6
17	6
18	2
19	9
20	3
21	8
22	4
23	2
24	7
25	7
26	0
27	2
28	2
29	5
30	4
31	2
32	9
33	4
34	3
35	4
36	2
37	2
38	6
39	0
40	6
41	1
42	5
43	3
44	7
45	9
46	5
47	6
48	7
49	3
50	9
51	7
52	4
53	7
54	8
55	0
56	4
57	6
58	5
59	1
60	6
61	2
62	2
63	3
64	8
65	0
66	1
67	4
68	4
69	6
70	0
71	3
72	7
73	3
74	3
75	3
76	5
77	1
78	7
79	7
80	5
81	6
82	0
83	0
84	3
85	6
86	4
87	1
88	7
89	1
90	6
91	2
92	3
93	3
94	5
95	9
96	1
97	3
98	3
99	0
100	8
101	6
102	0
103	8
104	9
105	7
106	3
107	5
108	3
109	1
110	6
111	3
112	4
113	3
114	6
115	1
116	9
117	4
118	6
119	1

n	a(n)
0	6
1	4
2	1
3	6
4	3
5	2
6	5
7	6
8	0
9	6
10	5
11	5
12	1
13	5
14	3
15	8
16	6
17	6
18	2
19	9
20	3
21	8
22	4
23	2
24	7
25	7
26	0
27	2
28	2
29	5
30	4
31	2
32	9
33	4
34	3
35	4
36	2
37	2
38	6
39	0
40	6
41	1
42	5
43	3
44	7
45	9
46	5
47	6
48	7
49	3
50	9
51	7
52	4
53	7
54	8
55	0
56	4
57	6
58	5
59	1
60	6
61	2
62	2
63	3
64	8
65	0
66	1
67	4
68	4
69	6
70	0
71	3
72	7
73	3
74	3
75	3
76	5
77	1
78	7
79	7
80	5
81	6
82	0
83	0
84	3
85	6
86	4
87	1
88	7
89	1
90	6
91	2
92	3
93	3
94	5
95	9
96	1
97	3
98	3
99	0
100	8
101	6
102	0
103	8
104	9
105	7
106	3
107	5
108	3
109	1
110	6
111	3
112	4
113	3
114	6
115	1
116	9
117	4
118	6
119	1