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A076986 as a simple table

na(n)
12
23
37
45
56
67
715
817
910
1011
1123
1213
1314
1415
1531
1617
1735
1819
1939
2021
2122
2223
2347
2473
2526
2653
2755
2829
2930
3031
3194
3233
3334
3435
3571
3637
3738
3839
3979
4041
4142
4243
4387
4489
4546
4647
4795
4897
49197
5051
51103
5253
53107
5455
55111
5657
5758
5859
59119
6061
6162
62187
63127
6465
6566

[2,3,7,5,6,7,15,17,10,11,23,13,14,15,31,17,35,19,
 39,21,22,23,47,73,26,53,55,29,30,31,94,33,34,35,
 71,37,38,39,79,41,42,43,87,89,46,47,95,97,197,51,
 103,53,107,55,111,57,58,59,119,61,62,187,127,65,
 66]