Numbers k such that 4*10^k - 87 is prime.

Terms

a(0) =2a(1) =5a(2) =7a(3) =13a(4) =16a(5) =20a(6) =29a(7) =37a(8) =43a(9) =49a(10) =101a(11) =888a(12) =2533a(13) =2569a(14) =2599a(15) =2666a(16) =3689a(17) =6335a(18) =9634a(19) =12445a(20) =17669a(21) =51208a(22) =79729