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

Terms

a(0) =45a(1) =13410a(2) =15855a(3) =31710a(4) =31785a(5) =63570a(6) =74025a(7) =85230a(8) =151830a(9) =202635a(10) =267300a(11) =280665a(12) =399675a(13) =405405a(14) =455250a(15) =466560a(16) =478170a(17) =480240a(18) =511335a(19) =534600a(20) =539475a(21) =561330a(22) =569520a(23) =589305a(24) =666945a(25) =716460a(26) =743160a(27) =748215a(28) =766785a(29) =799350