

A093212


a(n) is the largest number such that all of a(n)'s lengthn substrings are distinct and divisible by 12.


87



0, 72484, 97204804, 99720048004, 99972000480004, 99997200004800004, 99999720000048000004, 99999972000000480000004, 99999997200000004800000004, 99999999720000000048000000004
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OFFSET

1,2


COMMENTS

Observation: at least for the first nine positive terms a(n) is also the concatenation of n2 9´s, 72, n2 0's, 48, n2 0's, and 4.  Omar E. Pol, May 21 2017


LINKS



EXAMPLE

a(2) is 72484 because its length2 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



EXTENSIONS



STATUS

approved



