A046420 - cp's OEIS frontend

A046420 Prime factors of repunit of length a(n) are all of different lengths.

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	7
7	11
8	14
9	17
10	19
11	23
12	31
13	34
14	37
15	38
16	41
17	43
18	47
19	49
20	51
21	53
22	57
23	59
24	62
25	67
26	69
27	71
28	73
29	74
30	79
31	83
32	85
33	86
34	89
35	93
36	94
37	97
38	101
39	103
40	106
41	109
42	113
43	115
44	118
45	119
46	129
47	134
48	137
49	139
50	141
51	142
52	146
53	149
54	151
55	157
56	159
57	163

[1, 2, 3, 4, 5, 7, 11, 14, 17, 19, 23, 31, 34, 37, 38, 41, 43, 47, 49, 51, 53, 57, 59, 62, 67, 69, 71, 73, 74, 79, 83, 85, 86, 89, 93, 94, 97, 101, 103, 106, 109, 113, 115, 118, 119, 129, 134, 137, 139, 141, 142, 146, 149, 151, 157, 159, 163]

cp's OEIS Frontend

A046420 Prime factors of repunit of length a(n) are all of different lengths.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	7
7	11
8	14
9	17
10	19
11	23
12	31
13	34
14	37
15	38
16	41
17	43
18	47
19	49
20	51
21	53
22	57
23	59
24	62
25	67
26	69
27	71
28	73
29	74
30	79
31	83
32	85
33	86
34	89
35	93
36	94
37	97
38	101
39	103
40	106
41	109
42	113
43	115
44	118
45	119
46	129
47	134
48	137
49	139
50	141
51	142
52	146
53	149
54	151
55	157
56	159
57	163

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	7
7	11
8	14
9	17
10	19
11	23
12	31
13	34
14	37
15	38
16	41
17	43
18	47
19	49
20	51
21	53
22	57
23	59
24	62
25	67
26	69
27	71
28	73
29	74
30	79
31	83
32	85
33	86
34	89
35	93
36	94
37	97
38	101
39	103
40	106
41	109
42	113
43	115
44	118
45	119
46	129
47	134
48	137
49	139
50	141
51	142
52	146
53	149
54	151
55	157
56	159
57	163

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	7
7	11
8	14
9	17
10	19
11	23
12	31
13	34
14	37
15	38
16	41
17	43
18	47
19	49
20	51
21	53
22	57
23	59
24	62
25	67
26	69
27	71
28	73
29	74
30	79
31	83
32	85
33	86
34	89
35	93
36	94
37	97
38	101
39	103
40	106
41	109
42	113
43	115
44	118
45	119
46	129
47	134
48	137
49	139
50	141
51	142
52	146
53	149
54	151
55	157
56	159
57	163