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A181741 as a simple table

na(n)
13
25
37
411
513
623
729
831
947
1059
1161
12127
13191
14223
15239
16251
17383
18479
19503
20509
21991
221019
231021
242039
253583
263967
274079
284091
294093
306143
318191
3215359
3316127
3416319
3516381
3663487
3765407
3865519
39129023
40131063
41131071
42245759
43253951
44261631
45261887
46262079
47262111
48262127
49262139

[3,5,7,11,13,23,29,31,47,59,61,127,191,223,239,
 251,383,479,503,509,991,1019,1021,2039,3583,3967,
 4079,4091,4093,6143,8191,15359,16127,16319,16381,
 63487,65407,65519,129023,131063,131071,245759,
 253951,261631,261887,262079,262111,262127,262139]