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A218771 as a simple table

na(n)
131
259
379
4179
5191
6229
7251
8311
9389
10401
11479
12491
13541
14569
15719
16809
17971
181019
191061
201109
211151
221249
231301
241409
251451
261499
271619
281931
291949
302111
312141
322339
332591
342609
352711
362801
372939
383089
393371
403389
413449
423881
434021
444091
454211
464391
474451
484679
495039
505051

[31,59,79,179,191,229,251,311,389,401,479,491,541,
 569,719,809,971,1019,1061,1109,1151,1249,1301,
 1409,1451,1499,1619,1931,1949,2111,2141,2339,2591,
 2609,2711,2801,2939,3089,3371,3389,3449,3881,4021,
 4091,4211,4391,4451,4679,5039,5051]