A210421 - OEIS

A210421 as a simple table

n	a(n)
1	2
2	7
3	4
4	70
5	8
6	77
7	11
8	71
9	15
10	72
11	19
12	73
13	23
14	74
15	27
16	75
17	26
18	33
19	76
20	37
21	78
22	36
23	43
24	79
25	47
26	700
27	46
28	54
29	701
30	59
31	702
32	64
33	703
34	69
35	777
36	7777
37	77770
38	83
39	704
40	87
41	90
42	705
43	95
44	706
45	101
46	707
47	103
48	110
49	708
50	116
51	709
52	122
53	710
54	127
55	131
56	711
57	137
58	712
59	136

[2,7,4,70,8,77,11,71,15,72,19,73,23,74,27,75,26, 33,76,37,78,36,43,79,47,700,46,54,701,59,702,64, 703,69,777,7777,77770,83,704,87,90,705,95,706,101, 707,103,110,708,116,709,122,710,127,131,711,137, 712,136]