On an asymptotic formula for the niven numbers

Curtis N. Cooper, Robert E. Kennedy
1985 International Journal of Mathematics and Mathematical Sciences  
A Niven number is a positive integer which is divisible by its digital sum. A discussion of the possibility of an asymptotic formula forN(x)is given. Here,N(x)denotes the nmber of Niven numbers less thanx. A partial result will be presented. This result will be an asymptotic formula forNk(x)which denotes the number of Niven numbers less thanxwith digital sumk.
doi:10.1155/s0161171285000576 fatcat:wkk75kozk5fvxci2m2kf6fqvv4