Numbers k such that (298*10^k - 7)/3 is prime.

Terms

a(0) =0a(1) =1a(2) =2a(3) =9a(4) =16a(5) =23a(6) =33a(7) =40a(8) =42a(9) =45a(10) =48a(11) =137a(12) =176a(13) =553a(14) =775a(15) =2072a(16) =3259a(17) =7773a(18) =9457a(19) =17638a(20) =20838a(21) =22277a(22) =32672a(23) =47983a(24) =52308a(25) =54765a(26) =117229a(27) =228177