A020498 - cp's OEIS frontend

A020498 a(n) is the least number > a(n-1) such that there is no prime p for which a(1) through a(n) would contain all residues modulo p.

n	a(n)
1	1
2	3
3	7
4	9
5	13
6	19
7	21
8	27
9	31
10	33
11	37
12	43
13	49
14	51
15	57
16	63
17	69
18	73
19	79
20	87
21	91
22	97
23	99
24	103
25	111
26	117
27	121
28	129
29	133
30	139
31	141
32	147
33	153
34	157
35	159
36	163
37	169
38	177
39	183
40	187
41	189
42	199
43	201
44	211
45	213
46	217
47	231
48	241
49	243
50	247
51	253
52	261
53	267
54	271
55	273
56	279
57	283
58	289

[1, 3, 7, 9, 13, 19, 21, 27, 31, 33, 37, 43, 49, 51, 57, 63, 69, 73, 79, 87, 91, 97, 99, 103, 111, 117, 121, 129, 133, 139, 141, 147, 153, 157, 159, 163, 169, 177, 183, 187, 189, 199, 201, 211, 213, 217, 231, 241, 243, 247, 253, 261, 267, 271, 273, 279, 283, 289]

cp's OEIS Frontend

A020498 a(n) is the least number > a(n-1) such that there is no prime p for which a(1) through a(n) would contain all residues modulo p.

Table of values

List of values

n	a(n)
1	1
2	3
3	7
4	9
5	13
6	19
7	21
8	27
9	31
10	33
11	37
12	43
13	49
14	51
15	57
16	63
17	69
18	73
19	79
20	87
21	91
22	97
23	99
24	103
25	111
26	117
27	121
28	129
29	133
30	139
31	141
32	147
33	153
34	157
35	159
36	163
37	169
38	177
39	183
40	187
41	189
42	199
43	201
44	211
45	213
46	217
47	231
48	241
49	243
50	247
51	253
52	261
53	267
54	271
55	273
56	279
57	283
58	289

n	a(n)
1	1
2	3
3	7
4	9
5	13
6	19
7	21
8	27
9	31
10	33
11	37
12	43
13	49
14	51
15	57
16	63
17	69
18	73
19	79
20	87
21	91
22	97
23	99
24	103
25	111
26	117
27	121
28	129
29	133
30	139
31	141
32	147
33	153
34	157
35	159
36	163
37	169
38	177
39	183
40	187
41	189
42	199
43	201
44	211
45	213
46	217
47	231
48	241
49	243
50	247
51	253
52	261
53	267
54	271
55	273
56	279
57	283
58	289

n	a(n)
1	1
2	3
3	7
4	9
5	13
6	19
7	21
8	27
9	31
10	33
11	37
12	43
13	49
14	51
15	57
16	63
17	69
18	73
19	79
20	87
21	91
22	97
23	99
24	103
25	111
26	117
27	121
28	129
29	133
30	139
31	141
32	147
33	153
34	157
35	159
36	163
37	169
38	177
39	183
40	187
41	189
42	199
43	201
44	211
45	213
46	217
47	231
48	241
49	243
50	247
51	253
52	261
53	267
54	271
55	273
56	279
57	283
58	289