A293441 - cp's OEIS frontend

A293441 a(n) is the number of odd numbers k in range [2^n, (2^(n+1))-1] such that all terms in finite sequence [k, floor(k/2), floor(k/4), floor(k/8), ..., 1] are squarefree.

n	a(n)
0	1
1	1
2	2
3	3
4	4
5	5
6	7
7	8
8	11
9	15
10	20
11	29
12	37
13	47
14	67
15	84
16	120
17	152
18	202
19	268
20	351
21	469
22	640
23	859
24	1150
25	1560
26	2071
27	2801
28	3753
29	5078
30	6743
31	9132
32	12232
33	16379
34	22010
35	29601
36	39694
37	53450
38	71840
39	96380
40	129668
41	174059
42	234111
43	314402
44	422498
45	567724
46	762488
47	1024579
48	1376675
49	1850127
50	2485463
51	3339795

[1, 1, 2, 3, 4, 5, 7, 8, 11, 15, 20, 29, 37, 47, 67, 84, 120, 152, 202, 268, 351, 469, 640, 859, 1150, 1560, 2071, 2801, 3753, 5078, 6743, 9132, 12232, 16379, 22010, 29601, 39694, 53450, 71840, 96380, 129668, 174059, 234111, 314402, 422498, 567724, 762488, 1024579, 1376675, 1850127, 2485463, 3339795]

cp's OEIS Frontend

A293441 a(n) is the number of odd numbers k in range [2^n, (2^(n+1))-1] such that all terms in finite sequence [k, floor(k/2), floor(k/4), floor(k/8), ..., 1] are squarefree.

Table of values

List of values