Prime differences of Lucas 4-step numbers.

Terms

a(0) =3a(1) =11a(2) =19a(3) =23a(4) =47a(5) =73a(6) =701a(7) =1361a(8) =4363a(9) =9067a(10) =9749a(11) =17477a(12) =18743a(13) =18839a(14) =36293a(15) =70003a(16) =116101a(17) =134917a(18) =366437a(19) =465061a(20) =498749a(21) =501013a(22) =1844033a(23) =3590099a(24) =13305307a(25) =13341259a(26) =13341619a(27) =36229121a(28) =49069367a(29) =49570721