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A140297 as a simple table

na(n)
12
23
34
45
56
67
79
811
912
1013
1115
1216
1317
1419
1523
1624
1725
1828
1929
2031
2132
2235
2336
2437
2541
2643
2747
2849
2953
3055
3159
3261
3363
3467
3571
3672
3773
3877
3979
4081
4183
4289
4397
44101
45103
46107
47108
48109
49113
50121
51127
52131

[2,3,4,5,6,7,9,11,12,13,15,16,17,19,23,24,25,28,
 29,31,32,35,36,37,41,43,47,49,53,55,59,61,63,67,
 71,72,73,77,79,81,83,89,97,101,103,107,108,109,
 113,121,127,131]