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A274473 as a simple table

na(n)
01
13
21
33
41
53
617
751
81
93
1017
1151
12257
13771
144369
1513107
161
173
1817
1951
20257
21771
224369
2313107
2465537
25196611
261114129
273342387
2816843009
2950529027
30286331153
31858993459
321
333
3417
3551
36257
37771
384369
3913107
4065537
41196611
421114129
433342387
4416843009

[1,3,1,3,1,3,17,51,1,3,17,51,257,771,4369,13107,1,
 3,17,51,257,771,4369,13107,65537,196611,1114129,
 3342387,16843009,50529027,286331153,858993459,1,3,
 17,51,257,771,4369,13107,65537,196611,1114129,
 3342387,16843009]