Numbers k such that k+1, k^2+1, k^4+1 and k^8+1 are primes.

Terms

a(0) =1a(1) =2a(2) =4a(3) =19380a(4) =285090a(5) =337536a(6) =448630a(7) =532390a(8) =534430a(9) =545140a(10) =547536a(11) =585106a(12) =602056a(13) =677076a(14) =876180a(15) =1007386a(16) =1030200a(17) =1331950a(18) =1462000a(19) =1736346a(20) =1878790a(21) =1883856a(22) =2071960a(23) =2194666a(24) =2240890a(25) =2763010a(26) =2824720a(27) =3018606a(28) =3114996