A025742 - cp's OEIS frontend

A025742 a(n) is the index of 10^n within sequence of numbers of form 4^i*10^j.

n	a(n)
0	1
1	3
2	7
3	12
4	19
5	28
6	38
7	50
8	64
9	79
10	96
11	115
12	135
13	157
14	181
15	206
16	233
17	262
18	292
19	324
20	358
21	393
22	430
23	469
24	509
25	551
26	595
27	640
28	687
29	736
30	786
31	838
32	892
33	947
34	1004
35	1063
36	1123
37	1185
38	1249
39	1314
40	1381
41	1450
42	1520
43	1592
44	1666
45	1741
46	1818
47	1897
48	1977
49	2059
50	2143
51	2228

[1, 3, 7, 12, 19, 28, 38, 50, 64, 79, 96, 115, 135, 157, 181, 206, 233, 262, 292, 324, 358, 393, 430, 469, 509, 551, 595, 640, 687, 736, 786, 838, 892, 947, 1004, 1063, 1123, 1185, 1249, 1314, 1381, 1450, 1520, 1592, 1666, 1741, 1818, 1897, 1977, 2059, 2143, 2228]

cp's OEIS Frontend

A025742 a(n) is the index of 10^n within sequence of numbers of form 4^i*10^j.

Table of values

List of values