Greater of twin primes of (40n-23,40n-21).

Terms

a(0) =19a(1) =139a(2) =619a(3) =859a(4) =1699a(5) =2659a(6) =3259a(7) =4219a(8) =4339a(9) =5419a(10) =5659a(11) =7459a(12) =8539a(13) =9859a(14) =10459a(15) =10939a(16) =11059a(17) =11779a(18) =12379a(19) =13219a(20) =13339a(21) =15139a(22) =15739a(23) =17419a(24) =17659a(25) =19699a(26) =20899a(27) =21019a(28) =21379a(29) =21739