A284904 - cp's OEIS frontend

A284904 The number of integers k less than 2^n whose decimal representation of their reciprocals has an odd period.

n	a(n)
0	0
1	0
2	1
3	2
4	5
5	10
6	20
7	40
8	80
9	150
10	280
11	522
12	965
13	1802
14	3393
15	6426
16	12197
17	23236
18	44419
19	85116
20	163543
21	314837
22	607440
23	1174134
24	2273619
25	4409116
26	8561931
27	16646790
28	32404446
29	63145533
30	123173667

[0, 0, 1, 2, 5, 10, 20, 40, 80, 150, 280, 522, 965, 1802, 3393, 6426, 12197, 23236, 44419, 85116, 163543, 314837, 607440, 1174134, 2273619, 4409116, 8561931, 16646790, 32404446, 63145533, 123173667]

cp's OEIS Frontend

A284904 The number of integers k less than 2^n whose decimal representation of their reciprocals has an odd period.

Table of values

List of values