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A045968 as a simple table

na(n)
15
27
311
449
513
677
717
8343
9121
1091
1119
12539
1323
14119
15143
162401
1729
18847
1931
20637
21187
22133
2337
243773
25169
26161
271331
28833
2941
301001
3143
3216807
33209
34203
35221
365929
3747
38217
39253
404459
4153
421309
4359
44931
451573
46259
4761
4826411
49289
501183
51319
521127
5367
549317
55247

[5,7,11,49,13,77,17,343,121,91,19,539,23,119,143,
 2401,29,847,31,637,187,133,37,3773,169,161,1331,
 833,41,1001,43,16807,209,203,221,5929,47,217,253,
 4459,53,1309,59,931,1573,259,61,26411,289,1183,
 319,1127,67,9317,247]