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A039687 as a simple table

na(n)
17
213
397
4193
5769
612289
7786433
83221225473
9206158430209
106597069766657
11221360928884514619393
122353913150770005286438421033702874906038383291674012942337

[7,13,97,193,769,12289,786433,3221225473,
 206158430209,6597069766657,221360928884514619393,
 23539131507700052864384210337028749060383832916740\
 12942337]