A032917 - OEIS

A032917 as a simple table

n	a(n)
1	1
2	3
3	11
4	13
5	31
6	33
7	111
8	113
9	131
10	133
11	311
12	313
13	331
14	333
15	1111
16	1113
17	1131
18	1133
19	1311
20	1313
21	1331
22	1333
23	3111
24	3113
25	3131
26	3133
27	3311
28	3313
29	3331
30	3333
31	11111
32	11113
33	11131
34	11133
35	11311
36	11313
37	11331
38	11333
39	13111
40	13113

[1,3,11,13,31,33,111,113,131,133,311,313,331,333, 1111,1113,1131,1133,1311,1313,1331,1333,3111,3113, 3131,3133,3311,3313,3331,3333,11111,11113,11131, 11133,11311,11313,11331,11333,13111,13113]