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A139899 as a simple table

na(n)
15
253
3173
4197
5293
6317
7557
8653
9677
10773
11797
121013
131277
141373
151493
161613
171637
181733
191877
201973
211997
222213
232237
242333
252357
262477
272693
282837
292957
303413
313533
323557
333677
343797
353917
364013
374133
384157
394253
404373
414397
424493

[5,53,173,197,293,317,557,653,677,773,797,1013,
 1277,1373,1493,1613,1637,1733,1877,1973,1997,2213,
 2237,2333,2357,2477,2693,2837,2957,3413,3533,3557,
 3677,3797,3917,4013,4133,4157,4253,4373,4397,4493]