Numbers k such that 4*k-1, 8*k-1, 16*k-1, 32*k-1, 64*k-1 and 128*k-1 are all primes.

Terms

a(0) =15855a(1) =31785a(2) =267300a(3) =280665a(4) =399675a(5) =561330a(6) =946050a(7) =990510a(8) =1022220a(9) =1082115a(10) =1164735a(11) =1283250a(12) =1303875a(13) =1309545a(14) =1514880a(15) =1669065a(16) =1924410a(17) =2850225a(18) =3078675a(19) =3092760a(20) =3492270a(21) =3536385a(22) =3611205a(23) =3920670a(24) =4148970a(25) =4454775