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A140761 as a simple table

na(n)
12
25
319
441
583
6163
7167
8179
9191
10223
11229
12241
13263
14269
15271
16317
17337
18349
19367
20389
21433
22463
23491
24521
25701
26719
27757
28809
29823
30829
31859
32877
33883
34919
35941
36971
37991
38997
391021
401033
411049
421091
431153
441181
451193
461223
471291
481301
491319
501327
511361

[2,5,19,41,83,163,167,179,191,223,229,241,263,269,
 271,317,337,349,367,389,433,463,491,521,701,719,
 757,809,823,829,859,877,883,919,941,971,991,997,
 1021,1033,1049,1091,1153,1181,1193,1223,1291,1301,
 1319,1327,1361]