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A046255 as a simple table

na(n)
15
29
39
421
553
667
771
887
987
1091
11117
12161
13187
14213
15363
16419
17501
18537
19543
20739
21879
221101
231329
241391
251641
261939
272093
282109
292331
302557
312639
322697
332863
343441
353441
364413
374461
384479
394557
405489
416033
426267
436351
446973
457181
467459
477679
488113
498241

[5,9,9,21,53,67,71,87,87,91,117,161,187,213,363,
 419,501,537,543,739,879,1101,1329,1391,1641,1939,
 2093,2109,2331,2557,2639,2697,2863,3441,3441,4413,
 4461,4479,4557,5489,6033,6267,6351,6973,7181,7459,
 7679,8113,8241]