Related to Gilbreath conjecture.

Terms

a(0) =4a(1) =10a(2) =17a(3) =18a(4) =30a(5) =34a(6) =69a(7) =109a(8) =111a(9) =189a(10) =192a(11) =193a(12) =194a(13) =195a(14) =311a(15) =763a(16) =898a(17) =900a(18) =2215a(19) =2810a(20) =2811a(21) =2812a(22) =2813a(23) =3417a(24) =4260a(25) =6000a(26) =6002a(27) =6003a(28) =6004a(29) =23331