Prime Leonardo numbers.

Terms

a(0) =3a(1) =5a(2) =41a(3) =67a(4) =109a(5) =1973a(6) =5167a(7) =2692537a(8) =11405773a(9) =126491971a(10) =331160281a(11) =535828591a(12) =279167724889