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A239009 Exponents m such that the decimal expansion of 4^m exhibits its first zero from the right later than any previous exponent.

Table of values

n a(n)
1 0
2 2
3 4
4 7
5 9
6 12
7 14
8 16
9 17
10 23
11 34
12 36
13 38
14 43
15 77
16 88
17 216
18 350
19 979
20 24186
21 28678
22 134759
23 205829
24 374627
25 2200364
26 16625243
27 29451854
28 162613199
29 8078176309
30 9252290259
31 17556077280
32 49718535383
33 51616746477
34 54585993918

List of values

[0, 2, 4, 7, 9, 12, 14, 16, 17, 23, 34, 36, 38, 43, 77, 88, 216, 350, 979, 24186, 28678, 134759, 205829, 374627, 2200364, 16625243, 29451854, 162613199, 8078176309, 9252290259, 17556077280, 49718535383, 51616746477, 54585993918]