Numbers k such that (4*10^k + 143) / 3 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =7a(5) =9a(6) =15a(7) =21a(8) =22a(9) =44a(10) =49a(11) =53a(12) =63a(13) =127a(14) =145a(15) =393a(16) =856a(17) =1006a(18) =1883a(19) =2263a(20) =5684a(21) =13324a(22) =14291a(23) =27435a(24) =38897a(25) =114076