Octagonal numbers for which the sum of the digits is also an octagonal number.

Terms

a(0) =0a(1) =1a(2) =8a(3) =341a(4) =1160a(5) =4485a(6) =6816a(7) =9633a(8) =12936a(9) =16725a(10) =20501a(11) =25761a(12) =30401a(13) =36741a(14) =42960a(15) =64533a(16) =81345a(17) =90480a(18) =131880a(19) =143445a(20) =168033a(21) =181056a(22) =208560a(23) =238008a(24) =253461a(25) =269400a(26) =302736a(27) =338016a(28) =375240a(29) =414408