OFFSET
1,2
COMMENTS
These numbers are also called MHN-3 or Multiple Harshad Numbers-3.
A Multiple Harshad number is a Harshad number that, when divided by the sum of its digits, produces another Harshad number.
Starts to differ from A235507 at position n=70. - R. J. Mathar, Jun 13 2024
LINKS
Ray Chandler, Table of n, a(n) for n = 1..1947 (all a(n) <= 10^6)
Wikipedia, Harshad Number
EXAMPLE
756 is a term as it gives quotient 42 on division by the digital sum (i.e. 18). 42 gives quotient 7 on division by its digital sum (i.e. 6). As 7 is also a Harshad Number, thus 756 is a MHN-3.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Mihir Mathur, Jan 14 2014
STATUS
approved