Beach-Williams Pell numbers of type 2pqrs (p,q,r,s primes).

Terms

a(0) =18850a(1) =26650a(2) =39650a(3) =49010a(4) =53650a(5) =57850a(6) =76850a(7) =92650a(8) =103090a(9) =108650a(10) =142970a(11) =161650a(12) =198650a(13) =212602a(14) =235850a(15) =260660a(16) =265850a(17) =26750a(18) =273650a(19) =279850