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A277934 as a simple table

na(n)
01
13
21
37
41
57
617
7119
81
97
1017
11119
12257
131799
144369
1530583
161
177
1817
19119
20257
211799
224369
2330583
2465537
25458759
261114129
277798903
2816843009
29117901063
30286331153
312004318071
321
337
3417
35119
36257
371799
384369
3930583
4065537
41458759
421114129
437798903

[1,3,1,7,1,7,17,119,1,7,17,119,257,1799,4369,
 30583,1,7,17,119,257,1799,4369,30583,65537,458759,
 1114129,7798903,16843009,117901063,286331153,
 2004318071,1,7,17,119,257,1799,4369,30583,65537,
 458759,1114129,7798903]