A160676 - cp's OEIS frontend

A160676 Numbers k such that k and 2k use the same number of characters when expressed in Roman numerals.

n	a(n)
1	2
2	5
3	7
4	13
5	18
6	20
7	22
8	31
9	36
10	46
11	50
12	52
13	55
14	57
15	63
16	68
17	70
18	72
19	81
20	86
21	95
22	97
23	103
24	108
25	123
26	126
27	130
28	132
29	135
30	137
31	145
32	147
33	153
34	158
35	173
36	176
37	180
38	182
39	185
40	187
41	198
42	200
43	202
44	205
45	207
46	213
47	218
48	220
49	222
50	231
51	236
52	246
53	254
54	261
55	266
56	274

[2, 5, 7, 13, 18, 20, 22, 31, 36, 46, 50, 52, 55, 57, 63, 68, 70, 72, 81, 86, 95, 97, 103, 108, 123, 126, 130, 132, 135, 137, 145, 147, 153, 158, 173, 176, 180, 182, 185, 187, 198, 200, 202, 205, 207, 213, 218, 220, 222, 231, 236, 246, 254, 261, 266, 274]

cp's OEIS Frontend

A160676 Numbers k such that k and 2k use the same number of characters when expressed in Roman numerals.

Table of values

List of values

n	a(n)
1	2
2	5
3	7
4	13
5	18
6	20
7	22
8	31
9	36
10	46
11	50
12	52
13	55
14	57
15	63
16	68
17	70
18	72
19	81
20	86
21	95
22	97
23	103
24	108
25	123
26	126
27	130
28	132
29	135
30	137
31	145
32	147
33	153
34	158
35	173
36	176
37	180
38	182
39	185
40	187
41	198
42	200
43	202
44	205
45	207
46	213
47	218
48	220
49	222
50	231
51	236
52	246
53	254
54	261
55	266
56	274

n	a(n)
1	2
2	5
3	7
4	13
5	18
6	20
7	22
8	31
9	36
10	46
11	50
12	52
13	55
14	57
15	63
16	68
17	70
18	72
19	81
20	86
21	95
22	97
23	103
24	108
25	123
26	126
27	130
28	132
29	135
30	137
31	145
32	147
33	153
34	158
35	173
36	176
37	180
38	182
39	185
40	187
41	198
42	200
43	202
44	205
45	207
46	213
47	218
48	220
49	222
50	231
51	236
52	246
53	254
54	261
55	266
56	274

n	a(n)
1	2
2	5
3	7
4	13
5	18
6	20
7	22
8	31
9	36
10	46
11	50
12	52
13	55
14	57
15	63
16	68
17	70
18	72
19	81
20	86
21	95
22	97
23	103
24	108
25	123
26	126
27	130
28	132
29	135
30	137
31	145
32	147
33	153
34	158
35	173
36	176
37	180
38	182
39	185
40	187
41	198
42	200
43	202
44	205
45	207
46	213
47	218
48	220
49	222
50	231
51	236
52	246
53	254
54	261
55	266
56	274