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A251595 as a simple table

na(n)
12
23
34
45
56
67
710
811
913
1017
1118
1219
1323
1429
1531
1637
1741
1843
1947
2053
2159
2261
2367
2471
2573
2679
2783
2889
2997
30101
31103
32107
33109
34113
35127
36131
37137
38139
39149
40151
41157
42163
43167
44173
45179
46181
47191
48193
49197
50199
51211
52223
53227
54229
55233
56239
57241
58251
59257

[2,3,4,5,6,7,10,11,13,17,18,19,23,29,31,37,41,43,
 47,53,59,61,67,71,73,79,83,89,97,101,103,107,109,
 113,127,131,137,139,149,151,157,163,167,173,179,
 181,191,193,197,199,211,223,227,229,233,239,241,
 251,257]