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A343738 as a simple table

na(n)
13
25
311
4549755813881
523
653
719
817
947
10109
1143
1241
13103
1437
15227
1697
17223
1816349
192011
2089
21983
22536870869
2383
24977
2579
26461
27971
2873
2971
30197
3167
32193
33191
34524221
35443
36953
37439
38181
39179
40433
41431
42173
43130987
44937
45167
46421
47163
48929
491951
50157

[3,5,11,549755813881,23,53,19,17,47,109,43,41,103,
 37,227,97,223,16349,2011,89,983,536870869,83,977,
 79,461,971,73,71,197,67,193,191,524221,443,953,
 439,181,179,433,431,173,130987,937,167,421,163,
 929,1951,157]