A137689 - OEIS

A137689 as a simple table

n	a(n)
1	3
2	4
3	5
4	7
5	8
6	9
7	10
8	11
9	15
10	16
11	23
12	24
13	26
14	47
15	48
16	54
17	78
18	79
19	80
20	243
21	244
22	245
23	246
24	247
25	367
26	368
27	369
28	370
29	371
30	372
31	373
32	374
33	375
34	447
35	453
36	635
37	636
38	1656
39	1657
40	1658
41	1659
42	1660
43	18618
44	18619
45	18620
46	18621
47	18622
48	18623
49	18624
50	18625
51	18626
52	18627
53	18628
54	18629
55	18630
56	18631
57	18632
58	18633
59	18634
60	18635

[3,4,5,7,8,9,10,11,15,16,23,24,26,47,48,54,78,79, 80,243,244,245,246,247,367,368,369,370,371,372, 373,374,375,447,453,635,636,1656,1657,1658,1659, 1660,18618,18619,18620,18621,18622,18623,18624, 18625,18626,18627,18628,18629,18630,18631,18632, 18633,18634,18635]