A163142 - OEIS

A163142 as a simple table

n	a(n)
1	23
2	27
3	29
4	30
5	639
6	703
7	735
8	751
9	759
10	763
11	765
12	766
13	831
14	863
15	879
16	887
17	891
18	893
19	894
20	927
21	943
22	951
23	955
24	957
25	958
26	975
27	983
28	987
29	989
30	990
31	999
32	1003
33	1005
34	1006
35	1011
36	1013
37	1014
38	1017
39	1018
40	1020
41	18431
42	19455
43	19967
44	20223
45	20351
46	20415

[23,27,29,30,639,703,735,751,759,763,765,766,831, 863,879,887,891,893,894,927,943,951,955,957,958, 975,983,987,989,990,999,1003,1005,1006,1011,1013, 1014,1017,1018,1020,18431,19455,19967,20223,20351, 20415]