login

A117708 as a simple table

na(n)
13
27
313
431
537
667
7127
8211
9307
10409
11487
12541
13577
14631
15769
16787
17937
18991
191009
201039
211117
221201
231291
241459
251471
261567
271777
281801
292251
302281
312467
322557
332647
342971
353037
363187
373259
383307
393559
403709
413847
423889
434441
444567
454801
464969
474987

[3,7,13,31,37,67,127,211,307,409,487,541,577,631,
 769,787,937,991,1009,1039,1117,1201,1291,1459,
 1471,1567,1777,1801,2251,2281,2467,2557,2647,2971,
 3037,3187,3259,3307,3559,3709,3847,3889,4441,4567,
 4801,4969,4987]