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A076947 as a simple table

na(n)
17
213
321
431
543
657
71
891
97
10133
11157
12183
132
1452
15273
16307
17343
1819
1918
20463
213
22553
23601
24651
25703
261
2737
2826
29931
30993
314
321123
331191
341261
3538
3661
3727
389
39105
401723
411807
42372
435
442071
4591
462257
472353
482451
49119
502653
512757
5214
532971
54127
553193
5613
576
583541

[7,13,21,31,43,57,1,91,7,133,157,183,2,52,273,307,
 343,19,18,463,3,553,601,651,703,1,37,26,931,993,4,
 1123,1191,1261,38,61,27,9,105,1723,1807,372,5,
 2071,91,2257,2353,2451,119,2653,2757,14,2971,127,
 3193,13,6,3541]