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A135284 as a simple table

na(n)
13
21
37
47
519
625
749
843
997
1079
11127
12121
13169
14187
15169
16217
17211
18259
19253
20277
21277
22409
23403
24403
25475
26541
27583
28595
29625
30511
31799
32817
33799
34835
35745
361009
371015
381039
391033
401033
411075
421183
431267
441279
451285
461213
471405
481423
491477
501369
511597
521573

[3,1,7,7,19,25,49,43,97,79,127,121,169,187,169,
 217,211,259,253,277,277,409,403,403,475,541,583,
 595,625,511,799,817,799,835,745,1009,1015,1039,
 1033,1033,1075,1183,1267,1279,1285,1213,1405,1423,
 1477,1369,1597,1573]