Prime differences of tetranacci numbers.

Terms

a(0) =2a(1) =3a(2) =7a(3) =11a(4) =13a(5) =41a(6) =79a(7) =107a(8) =179a(9) =193a(10) =293a(11) =397a(12) =769a(13) =1489a(14) =2099a(15) =2843a(16) =2857a(17) =5507a(18) =5521a(19) =9181a(20) =10463a(21) =10663a(22) =10667a(23) =19079a(24) =39619a(25) =76423a(26) =126743a(27) =146539a(28) =147283a(29) =147311