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A260805 as a simple table

na(n)
117
231
341
471
5103
6113
7151
8191
9239
10263
11271
12281
13311
14353
15431
16479
17503
18521
19599
20719
21743
22823
23863
24911
25953
261031
271103
281151
291319
301361
311439
321487
331511
341583
351607
361663
371831
381871
392039
402087
412111
422423
432663
442711
452791
462801
472903
482999

[17,31,41,71,103,113,151,191,239,263,271,281,311,
 353,431,479,503,521,599,719,743,823,863,911,953,
 1031,1103,1151,1319,1361,1439,1487,1511,1583,1607,
 1663,1831,1871,2039,2087,2111,2423,2663,2711,2791,
 2801,2903,2999]