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A065764 as a simple table

na(n)
11
27
313
431
531
691
757
8127
9121
10217
11133
12403
13183
14399
15403
16511
17307
18847
19381
20961
21741
22931
23553
241651
25781
261281
271093
281767
29871
302821
31993
322047
331729
342149
351767
363751
371407
382667
392379
403937
411723
425187
431893
444123
453751
463871
472257
486643

[1,7,13,31,31,91,57,127,121,217,133,403,183,399,
 403,511,307,847,381,961,741,931,553,1651,781,1281,
 1093,1767,871,2821,993,2047,1729,2149,1767,3751,
 1407,2667,2379,3937,1723,5187,1893,4123,3751,3871,
 2257,6643]