Numbers n such that n#*2^n+1 is prime, where n# = product of primes <= n.

Terms

a(0) =1a(1) =4a(2) =7a(3) =20a(4) =22a(5) =27a(6) =32a(7) =37a(8) =48a(9) =68a(10) =122a(11) =128a(12) =148a(13) =152a(14) =155a(15) =159a(16) =160a(17) =198a(18) =216a(19) =217a(20) =239a(21) =247a(22) =248a(23) =306a(24) =363a(25) =429a(26) =475a(27) =515a(28) =606a(29) =651