OFFSET
1,2
COMMENTS
Observation: at least for the first nine positive terms a(n) is also the concatenation of n-2 9´s, 72, n-2 0's, 48, n-2 0's, and 4. - Omar E. Pol, May 21 2017
LINKS
Hans Havermann, Table of A093211-A093299
EXAMPLE
a(2) is 72484 because its length-2 substrings (72, 24, 48, 84) are all distinct and divisible by 12 and there is no larger number with this property
CROSSREFS
KEYWORD
base,nonn,more
AUTHOR
Hans Havermann, Mar 28 2004
EXTENSIONS
a(8)-a(10) from John Cerkan, May 21 2017
STATUS
approved