A306388 - cp's OEIS frontend

A306388 a(n) is a decimal number k having a length n binary expansion which encodes, from left to right at digit j, the coprimality (0) or non-coprimality (1) of j to n, for 1 < j <= n, except for the first digit, which is always 1.

n	a(n)
1	1
2	3
3	5
4	13
5	17
6	61
7	65
8	213
9	329
10	885
11	1025
12	3933
13	4097
14	13781
15	22121
16	54613
17	65537
18	251741
19	262145
20	906613
21	1364681
22	3497301
23	4194305
24	16111453
25	17859617
26	55932245
27	86282825
28	225793493
29	268435457
30	1064687485
31	1073741825
32	3579139413
33	5526297161
34	14316688725

[1, 3, 5, 13, 17, 61, 65, 213, 329, 885, 1025, 3933, 4097, 13781, 22121, 54613, 65537, 251741, 262145, 906613, 1364681, 3497301, 4194305, 16111453, 17859617, 55932245, 86282825, 225793493, 268435457, 1064687485, 1073741825, 3579139413, 5526297161, 14316688725]

cp's OEIS Frontend

A306388 a(n) is a decimal number k having a length n binary expansion which encodes, from left to right at digit j, the coprimality (0) or non-coprimality (1) of j to n, for 1 < j <= n, except for the first digit, which is always 1.

Table of values

List of values