A300509 - cp's OEIS frontend

A300509 a(n) is the number of numbers in the interval [2^(n-1), 2^n-1] that have exactly n divisors.

n	a(n)
1	1
2	2
3	1
4	4
5	1
6	6
7	1
8	25
9	3
10	10
11	1
12	212
13	1
14	27
15	8
16	3625
17	1
18	1291
19	1
20	7687
21	18
22	265
23	1
24	629369
25	4
26	885
27	695
28	365370
29	1
30	685360
31	1
32	178723829
33	131
34	10782
35	12
36	311470930
37	1
38	38692
39	413
40	6162245368
41	1
42	381481569
43	1
44	1067082439
45	139407
46	513855
47	1

[1, 2, 1, 4, 1, 6, 1, 25, 3, 10, 1, 212, 1, 27, 8, 3625, 1, 1291, 1, 7687, 18, 265, 1, 629369, 4, 885, 695, 365370, 1, 685360, 1, 178723829, 131, 10782, 12, 311470930, 1, 38692, 413, 6162245368, 1, 381481569, 1, 1067082439, 139407, 513855, 1]

cp's OEIS Frontend

A300509 a(n) is the number of numbers in the interval [2^(n-1), 2^n-1] that have exactly n divisors.

Table of values

List of values