Triangular Carmichael numbers.

Terms

a(0) =561a(1) =8911a(2) =10585a(3) =41041a(4) =115921a(5) =314821a(6) =334153a(7) =6313681a(8) =8134561a(9) =14913991a(10) =32914441a(11) =60957361a(12) =67902031a(13) =135556345a(14) =289766701a(15) =321197185a(16) =329769721a(17) =368113411a(18) =471905281a(19) =765245881a(20) =842202361a(21) =962442001a(22) =1507746241a(23) =2489462641a(24) =2588653081a(25) =3104207821