A025747 - cp's OEIS frontend

A025747 Index of 10^n within sequence of numbers of form 9^i*10^j.

n	a(n)
0	1
1	3
2	6
3	10
4	15
5	21
6	28
7	36
8	45
9	55
10	66
11	78
12	91
13	105
14	120
15	136
16	153
17	171
18	190
19	210
20	231
21	254
22	278
23	303
24	329
25	356
26	384
27	413
28	443
29	474
30	506
31	539
32	573
33	608
34	644
35	681
36	719
37	758
38	798
39	839
40	881
41	924
42	969
43	1015
44	1062
45	1110
46	1159
47	1209
48	1260
49	1312
50	1365
51	1419
52	1474
53	1530
54	1587

[1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91, 105, 120, 136, 153, 171, 190, 210, 231, 254, 278, 303, 329, 356, 384, 413, 443, 474, 506, 539, 573, 608, 644, 681, 719, 758, 798, 839, 881, 924, 969, 1015, 1062, 1110, 1159, 1209, 1260, 1312, 1365, 1419, 1474, 1530, 1587]

cp's OEIS Frontend

A025747 Index of 10^n within sequence of numbers of form 9^i*10^j.

Table of values

List of values