OFFSET
1,2
LINKS
Hans Havermann, Table of A093211-A093299
EXAMPLE
a(4) is 996399 because its length-4 substrings (9963, 9639, 6399) are all distinct and divisible by 81 and there is no larger number with this property.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Hans Havermann, Mar 29 2004
EXTENSIONS
a(11)-a(15) from John Cerkan, Jan 05 2018
STATUS
approved