A350150 - cp's OEIS frontend

A350150 a(1)=1; thereafter a(n+1) is the smallest unused number k such that d(k) and d(a(n)) are coprime, where d is the divisor counting function A000005.

n	a(n)
1	1
2	2
3	4
4	3
5	9
6	5
7	16
8	6
9	25
10	7
11	36
12	8
13	49
14	10
15	64
16	11
17	81
18	12
19	625
20	13
21	100
22	14
23	121
24	15
25	144
26	17
27	169
28	19
29	196
30	21
31	225
32	22
33	256
34	23
35	289
36	24
37	324
38	26
39	361
40	27
41	400
42	29
43	441
44	30
45	484
46	31
47	529
48	33
49	576
50	34
51	676
52	35
53	729
54	18
55	1024
56	20
57	1296
58	28
59	2401
60	32
61	4096

[1, 2, 4, 3, 9, 5, 16, 6, 25, 7, 36, 8, 49, 10, 64, 11, 81, 12, 625, 13, 100, 14, 121, 15, 144, 17, 169, 19, 196, 21, 225, 22, 256, 23, 289, 24, 324, 26, 361, 27, 400, 29, 441, 30, 484, 31, 529, 33, 576, 34, 676, 35, 729, 18, 1024, 20, 1296, 28, 2401, 32, 4096]

cp's OEIS Frontend

A350150 a(1)=1; thereafter a(n+1) is the smallest unused number k such that d(k) and d(a(n)) are coprime, where d is the divisor counting function A000005.

Table of values

List of values