A161889 - cp's OEIS frontend

A161889 a(1)=2. a(n) = the smallest integer > a(n-1) that is coprime to n, and is such that (a(n)-a(n-1)) is not a divisor of n.

n	a(n)
1	2
2	5
3	7
4	13
5	16
6	23
7	25
8	31
9	35
10	39
11	41
12	49
13	51
14	55
15	59
16	65
17	67
18	71
19	73
20	79
21	83
22	87
23	89
24	103
25	106
26	109
27	113
28	121
29	123
30	127
31	129
32	135
33	137
34	141
35	143
36	151
37	153
38	157
39	161
40	167
41	169
42	173
43	175
44	181
45	187
46	191
47	193
48	203
49	205
50	209
51	211
52	217
53	219
54	223
55	226
56	229
57	233
58	237

[2, 5, 7, 13, 16, 23, 25, 31, 35, 39, 41, 49, 51, 55, 59, 65, 67, 71, 73, 79, 83, 87, 89, 103, 106, 109, 113, 121, 123, 127, 129, 135, 137, 141, 143, 151, 153, 157, 161, 167, 169, 173, 175, 181, 187, 191, 193, 203, 205, 209, 211, 217, 219, 223, 226, 229, 233, 237]

cp's OEIS Frontend

A161889 a(1)=2. a(n) = the smallest integer > a(n-1) that is coprime to n, and is such that (a(n)-a(n-1)) is not a divisor of n.

Table of values

List of values

n	a(n)
1	2
2	5
3	7
4	13
5	16
6	23
7	25
8	31
9	35
10	39
11	41
12	49
13	51
14	55
15	59
16	65
17	67
18	71
19	73
20	79
21	83
22	87
23	89
24	103
25	106
26	109
27	113
28	121
29	123
30	127
31	129
32	135
33	137
34	141
35	143
36	151
37	153
38	157
39	161
40	167
41	169
42	173
43	175
44	181
45	187
46	191
47	193
48	203
49	205
50	209
51	211
52	217
53	219
54	223
55	226
56	229
57	233
58	237

n	a(n)
1	2
2	5
3	7
4	13
5	16
6	23
7	25
8	31
9	35
10	39
11	41
12	49
13	51
14	55
15	59
16	65
17	67
18	71
19	73
20	79
21	83
22	87
23	89
24	103
25	106
26	109
27	113
28	121
29	123
30	127
31	129
32	135
33	137
34	141
35	143
36	151
37	153
38	157
39	161
40	167
41	169
42	173
43	175
44	181
45	187
46	191
47	193
48	203
49	205
50	209
51	211
52	217
53	219
54	223
55	226
56	229
57	233
58	237

n	a(n)
1	2
2	5
3	7
4	13
5	16
6	23
7	25
8	31
9	35
10	39
11	41
12	49
13	51
14	55
15	59
16	65
17	67
18	71
19	73
20	79
21	83
22	87
23	89
24	103
25	106
26	109
27	113
28	121
29	123
30	127
31	129
32	135
33	137
34	141
35	143
36	151
37	153
38	157
39	161
40	167
41	169
42	173
43	175
44	181
45	187
46	191
47	193
48	203
49	205
50	209
51	211
52	217
53	219
54	223
55	226
56	229
57	233
58	237