OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
EXAMPLE
a(11)=12131415161718 because the 11th Harshad is 12 and the 12th
is 18 and we concatenate those with the increasing numbers between.
MATHEMATICA
FromDigits[Flatten[IntegerDigits/@Range[#[[1]], #[[2]]]]]&/@Partition[ Select[ Range[80], Divisible[#, Total[IntegerDigits[#]]]&], 2, 1] (* Harvey P. Dale, Feb 10 2019 *)
CROSSREFS
KEYWORD
base,easy,nonn
AUTHOR
Jason Earls, Aug 27 2005
STATUS
approved