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A077718 as a simple table

na(n)
15
217
3257
4277
5337
61093
71109
81297
91301
101361
114177
124357
134373
144421
155189
165381
175393
185441
1916453
2016657
2116661
2217477
2317489
2417669
2517681
2617729
2717749
2820549
2920753
3021521
3121569
3221589
3321841
3465537
3565557
3665617
3765809
3866629

[5,17,257,277,337,1093,1109,1297,1301,1361,4177,
 4357,4373,4421,5189,5381,5393,5441,16453,16657,
 16661,17477,17489,17669,17681,17729,17749,20549,
 20753,21521,21569,21589,21841,65537,65557,65617,
 65809,66629]