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A247665 as a simple table

na(n)
12
23
34
45
57
69
78
811
913
1017
1119
1223
1315
1429
1514
1631
1737
1841
1943
2047
2153
2259
2361
2467
2571
2673
2725
2827
2979
3083
3116
3249
3389
3497
35101
36103
37107
38109
39113
40121
41127
42131
43137
44139
45149
46151
47157
48163
49167
50169
51173
52179
53181
54191
5585
56193
5757
58197
59199
60211
61223

[2,3,4,5,7,9,8,11,13,17,19,23,15,29,14,31,37,41,
 43,47,53,59,61,67,71,73,25,27,79,83,16,49,89,97,
 101,103,107,109,113,121,127,131,137,139,149,151,
 157,163,167,169,173,179,181,191,85,193,57,197,199,
 211,223]