Niven (or Harshad, or harshad) numbers: numbers that are divisible by the sum of their digits.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =7a(7) =8a(8) =9a(9) =10a(10) =12a(11) =18a(12) =20a(13) =21a(14) =24a(15) =27a(16) =30a(17) =36a(18) =40a(19) =42a(20) =45a(21) =48a(22) =50a(23) =54a(24) =60a(25) =63a(26) =70a(27) =72a(28) =80a(29) =81