Sevens

[Hans Havermann]

0, 63, 7567, 774977, 77742777, 99993699993, 777779177777, 
77777784777777, 7777777147777777, 7777777770777777777, 
777777777007777777770, ...

a(n) is the largest number such that all of a(n)'s length-n substrings 
are distinct and divisible by 63. [A093263]

If there's any pattern here, it's not obvious to me. I wonder how many 
more terms sport the multi-seven thing before we get another exception.
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