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A130970 as a simple table

na(n)
13
22
33
43
53
65
713
83
97
1013
1123
125
1337
1411
1531
1637
1743
1829
193
207
2141
2247
2319
2473
2589
2637
2771
2843
29101
3097
31131
323
3373
3411
35151
3623
3729
38131
39103
40109
41163
4253
43127
44191
45181
4671
4783
48191
49163
50101
51229
52223
53113
54283
55193
567
5713
58239
59149
60277
61251
6237
63179
64307
65281
6661

[3,2,3,3,3,5,13,3,7,13,23,5,37,11,31,37,43,29,3,7,
 41,47,19,73,89,37,71,43,101,97,131,3,73,11,151,23,
 29,131,103,109,163,53,127,191,181,71,83,191,163,
 101,229,223,113,283,193,7,13,239,149,277,251,37,
 179,307,281,61]