Positive integers n such that n^19 + 1 is semiprime (A001358).

Terms

a(0) =2a(1) =10a(2) =28a(3) =106a(4) =190a(5) =292a(6) =556a(7) =756a(8) =858a(9) =906a(10) =1012a(11) =1030a(12) =1032a(13) =1060a(14) =1372a(15) =1450a(16) =1488a(17) =1720a(18) =1722a(19) =1758a(20) =1782a(21) =1822a(22) =1972a(23) =2356a(24) =2436a(25) =2446a(26) =2620a(27) =2748a(28) =2788a(29) =2998