Numbers k such that k+1, k^2+1 and k^4+1 are primes.

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =16a(5) =180a(6) =210a(7) =430a(8) =466a(9) =556a(10) =690a(11) =760a(12) =936a(13) =966a(14) =1150a(15) =1870a(16) =2266a(17) =2646a(18) =2676a(19) =3390a(20) =3516a(21) =3910a(22) =4006a(23) =4566a(24) =4590a(25) =4936a(26) =5086a(27) =6576a(28) =6970a(29) =8626