Numbers k such that 5*10^k - 13 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =15a(4) =20a(5) =30a(6) =90a(7) =120a(8) =125a(9) =141a(10) =326a(11) =464a(12) =491a(13) =494a(14) =540a(15) =558a(16) =822a(17) =1103a(18) =1463a(19) =1638a(20) =1898a(21) =3332a(22) =10671a(23) =24842a(24) =37412a(25) =48855a(26) =173904