Primes occurring in A091074.

Terms

a(0) =67a(1) =79a(2) =967a(3) =4093a(4) =118843a(5) =1317989a(6) =2132551a(7) =5583091a(8) =100184503a(9) =686674799a(10) =2908801127a(11) =12321879307a(12) =221107152727a(13) =936624929263