A293230 - cp's OEIS frontend

A293230 a(n) is the number of integers 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	2
2	3
3	5
4	7
5	9
6	12
7	15
8	19
9	26
10	35
11	49
12	66
13	84
14	114
15	151
16	204
17	272
18	354
19	470
20	619
21	820
22	1109
23	1499
24	2009
25	2710
26	3631
27	4872
28	6554
29	8831
30	11821
31	15875
32	21364
33	28611
34	38389
35	51611
36	69295
37	93144
38	125290
39	168220
40	226048
41	303727
42	408170
43	548513
44	736900
45	990222
46	1330212
47	1787067
48	2401254
49	3226802
50	4335590
51	5825258

[1, 2, 3, 5, 7, 9, 12, 15, 19, 26, 35, 49, 66, 84, 114, 151, 204, 272, 354, 470, 619, 820, 1109, 1499, 2009, 2710, 3631, 4872, 6554, 8831, 11821, 15875, 21364, 28611, 38389, 51611, 69295, 93144, 125290, 168220, 226048, 303727, 408170, 548513, 736900, 990222, 1330212, 1787067, 2401254, 3226802, 4335590, 5825258]

cp's OEIS Frontend

A293230 a(n) is the number of integers 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