A355483 - cp's OEIS frontend

A355483 a(1) = 1; for n > 1, a(n) is the smallest positive number that has not yet appeared such that the number of 1-bits in the binary expansion of a(n) equals the number of divisors of a(n-1).

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	15
7	23
8	9
9	7
10	10
11	27
12	29
13	12
14	63
15	95
16	30
17	255
18	383
19	17
20	18
21	111
22	39
23	43
24	20
25	119
26	45
27	123
28	46
29	51
30	53
31	24
32	447
33	54
34	479
35	33
36	57
37	58
38	60
39	4095
40	16777215
41	79228162514264337593543950335

[1, 2, 3, 5, 6, 15, 23, 9, 7, 10, 27, 29, 12, 63, 95, 30, 255, 383, 17, 18, 111, 39, 43, 20, 119, 45, 123, 46, 51, 53, 24, 447, 54, 479, 33, 57, 58, 60, 4095, 16777215, 79228162514264337593543950335]

cp's OEIS Frontend

A355483 a(1) = 1; for n > 1, a(n) is the smallest positive number that has not yet appeared such that the number of 1-bits in the binary expansion of a(n) equals the number of divisors of a(n-1).

Table of values

List of values