A244861 - cp's OEIS frontend

A244861 Consider the concatenation in ascending order of the first x natural numbers and then concatenate its reverse. Sequence gives the decimal expansion of the sum of the reciprocals of such numbers.

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

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

cp's OEIS Frontend

A244861 Consider the concatenation in ascending order of the first x natural numbers and then concatenate its reverse. Sequence gives the decimal expansion of the sum of the reciprocals of such numbers.

Table of values

List of values

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

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

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