Leyland numbers which are products of two distinct primes.

Terms

a(0) =57a(1) =145a(2) =177a(3) =1649a(4) =7073a(5) =23401a(6) =131361a(7) =423393a(8) =2012174a(9) =4785713a(10) =33555057a(11) =43050817a(12) =177264449a(13) =364568617a(14) =1073792449a(15) =4486784401a(16) =13877119009a(17) =31381070257a(18) =94143190994a(19) =125937424601