Least number k such that k^n + n and k^n - n are both prime, or 0 if no such number exists.

Terms

a(0) =4a(1) =3a(2) =2a(3) =0a(4) =42a(5) =175a(6) =66a(7) =3a(8) =2a(9) =4983a(10) =1770a(11) =55055a(12) =28686a(13) =18765a(14) =8456a(15) =0a(16) =594a(17) =128345a(18) =136080a(19) =81a(20) =92a(21) =1163409a(22) =18810a(23) =10415a(24) =11754a(25) =3855a(26) =0a(27) =86043a(28) =38880a(29) =17639