A172999 - cp's OEIS frontend

A172999 a(1)=1, a(2)=4; for n>=3, a(n) is the smallest number larger than a(n-1) such that, for every k a(n) is relatively prime to a(k) iff n is relatively prime to k.

n	a(n)
1	1
2	4
3	5
4	6
5	7
6	10
7	11
8	12
9	25
10	28
11	29
12	30
13	31
14	44
15	175
16	178
17	179
18	180
19	181
20	182
21	275
22	348
23	349
24	360
25	371
26	372
27	395
28	396
29	397
30	420
31	421
32	422
33	725
34	1074
35	1309
36	1310
37	1319
38	1448
39	2945
40	2954
41	2957
42	2970
43	2971
44	3016
45	3325
46	4188
47	4189
48	4190
49	4213
50	4214
51	4475
52	4526

[1, 4, 5, 6, 7, 10, 11, 12, 25, 28, 29, 30, 31, 44, 175, 178, 179, 180, 181, 182, 275, 348, 349, 360, 371, 372, 395, 396, 397, 420, 421, 422, 725, 1074, 1309, 1310, 1319, 1448, 2945, 2954, 2957, 2970, 2971, 3016, 3325, 4188, 4189, 4190, 4213, 4214, 4475, 4526]

cp's OEIS Frontend

A172999 a(1)=1, a(2)=4; for n>=3, a(n) is the smallest number larger than a(n-1) such that, for every k a(n) is relatively prime to a(k) iff n is relatively prime to k.

Table of values

List of values