A039456 - OEIS

A039456 as a simple table

n	a(n)
1	21
2	111
3	131
4	153
5	164
6	175
7	186
8	197
9	208
10	219
11	230
12	231
13	233
14	234
15	235
16	236
17	237
18	238
19	239
20	240
21	263
22	353
23	384
24	474
25	505
26	595
27	626
28	716
29	747
30	837
31	868
32	958
33	989
34	1079
35	1110
36	1200
37	1211
38	1221
39	1223
40	1224
41	1225
42	1226
43	1227
44	1228
45	1229
46	1230
47	1233

[21,111,131,153,164,175,186,197,208,219,230,231, 233,234,235,236,237,238,239,240,263,353,384,474, 505,595,626,716,747,837,868,958,989,1079,1110, 1200,1211,1221,1223,1224,1225,1226,1227,1228,1229, 1230,1233]