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A188339 as a simple table

na(n)
15
253
361
4193
5227
6257
7307
8317
9383
10457
11577
12601
13607
14653
15727
16751
17947
181019
191031
201039
211049
221093
231123
241193
251259
261283
271409
281471
291483
301607
311613
321667
331987
342011
352029
362203
372357
382371
392377
402909
412939
423011
433049
443089
453163

[5,53,61,193,227,257,307,317,383,457,577,601,607,
 653,727,751,947,1019,1031,1039,1049,1093,1123,
 1193,1259,1283,1409,1471,1483,1607,1613,1667,1987,
 2011,2029,2203,2357,2371,2377,2909,2939,3011,3049,
 3089,3163]