login

A069751 as a simple table

na(n)
12
23
34
45
56
67
78
89
910
1011
1115
1213
1314
1419
1516
1622
1718
1825
1920
2036
2128
2223
2345
2440
2536
2644
2750
2835
2936
3037
3154
3255
3356
34139
3571
3643
3774
38123
3975
4063
4165
42113
43139
44140
45139
46132
47133
4885
49100
50178
51148
52376
5398
54234
55139
561277
57234
58223
5995
60217
61128
62479
63139
64454

[2,3,4,5,6,7,8,9,10,11,15,13,14,19,16,22,18,25,20,
 36,28,23,45,40,36,44,50,35,36,37,54,55,56,139,71,
 43,74,123,75,63,65,113,139,140,139,132,133,85,100,
 178,148,376,98,234,139,1277,234,223,95,217,128,
 479,139,454]