A147884 - cp's OEIS frontend

A147884 a(n) is the smallest positive integer k such that the last n digits of 2^k are 1 or 2.

n	a(n)
1	1
2	9
3	89
4	89
5	589
6	3089
7	3089
8	3089
9	315589
10	315589
11	8128089
12	164378089
13	945628089
14	1922190589
15	11687815589
16	109344065589
17	231414378089
18	1452117503089
19	4503875315589
20	65539031565589
21	141832976878089
22	1667711883128089
23	3575060515940589

[1, 9, 89, 89, 589, 3089, 3089, 3089, 315589, 315589, 8128089, 164378089, 945628089, 1922190589, 11687815589, 109344065589, 231414378089, 1452117503089, 4503875315589, 65539031565589, 141832976878089, 1667711883128089, 3575060515940589]

cp's OEIS Frontend

A147884 a(n) is the smallest positive integer k such that the last n digits of 2^k are 1 or 2.

Table of values

List of values