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A061712 as a simple table

na(n)
12
23
37
423
531
6311
7127
8383
9991
102039
113583
126143
138191
1473727
1563487
16129023
17131071
18522239
19524287
201966079
214128767
2216250879
2314680063
2433546239
2567108351
26201064447
27260046847
28536739839
291073479679
305335154687
312147483647

[2,3,7,23,31,311,127,383,991,2039,3583,6143,8191,
 73727,63487,129023,131071,522239,524287,1966079,
 4128767,16250879,14680063,33546239,67108351,
 201064447,260046847,536739839,1073479679,
 5335154687,2147483647]