A283871 - OEIS

A283871 as a simple table

n	a(n)
1	11
2	22
3	33
4	44
5	55
6	66
7	77
8	88
9	99
10	1001
11	1010
12	1100
13	1111
14	1122
15	1133
16	1144
17	1155
18	1166
19	1177
20	1188
21	1199
22	1212
23	1221
24	1313
25	1331
26	1414
27	1441
28	1515
29	1551
30	1616
31	1661
32	1717
33	1771
34	1818
35	1881
36	1919
37	1991
38	2002
39	2020
40	2112
41	2121
42	2200
43	2211
44	2222
45	2233
46	2244
47	2255
48	2266
49	2277
50	2288
51	2299
52	2323
53	2332
54	2424
55	2442
56	2525

[11,22,33,44,55,66,77,88,99,1001,1010,1100,1111, 1122,1133,1144,1155,1166,1177,1188,1199,1212,1221, 1313,1331,1414,1441,1515,1551,1616,1661,1717,1771, 1818,1881,1919,1991,2002,2020,2112,2121,2200,2211, 2222,2233,2244,2255,2266,2277,2288,2299,2323,2332, 2424,2442,2525]