a(n) = smallest prime which can be expressed as a sum of distinct powers of n.

Terms

a(0) =2a(1) =3a(2) =5a(3) =5a(4) =7a(5) =7a(6) =73a(7) =739a(8) =11a(9) =11a(10) =13a(11) =13a(12) =197a(13) =241a(14) =17a(15) =17a(16) =19a(17) =19a(18) =401a(19) =463a(20) =23a(21) =23a(22) =577a(23) =10171901a(24) =677a(25) =757a(26) =29a(27) =29a(28) =31a(29) =31