A387580 - OEIS

A387580 as a simple table

n	a(n)
1	2
2	3
3	6
4	7
5	8
6	9
7	18
8	19
9	20
10	21
11	22
12	23
13	51
14	52
15	53
16	54
17	55
18	56
19	57
20	58
21	144
22	145
23	146
24	147
25	148
26	149
27	150
28	151
29	152
30	153
31	398
32	399
33	400
34	401
35	402
36	403
37	404
38	405
39	406
40	407
41	408
42	409
43	1090
44	1091
45	1092
46	1093
47	1094
48	1095
49	1096
50	1097
51	1098
52	1099
53	1100
54	1101
55	1102
56	1103
57	2973
58	2974

[2,3,6,7,8,9,18,19,20,21,22,23,51,52,53,54,55,56, 57,58,144,145,146,147,148,149,150,151,152,153,398, 399,400,401,402,403,404,405,406,407,408,409,1090, 1091,1092,1093,1094,1095,1096,1097,1098,1099,1100, 1101,1102,1103,2973,2974]