a(n) is the least k such that n is divisible by the sum of digits of k and k is divisible by the sum of digits of n; a(n) = -1 if no such k exists.
A344487
a(n) is the least k such that n is divisible by the sum of digits of k and k is divisible by the sum of digits of n; a(n) = -1 if no such k exists.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =7a(7) =8a(8) =9a(9) =1a(10) =10a(11) =3a(12) =76a(13) =10a(14) =12a(15) =35a(16) =296a(17) =9a(18) =10a(19) =2a(20) =3a(21) =20a(22) =10a(23) =6a(24) =14a(25) =184a(26) =9a(27) =10a(28) =20999a(29) =3
External references
- oeis: A344487