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A112904
a(n) is the least positive integer in base 10 containing n sevens that is divisible by n.
1
7, 770, 777, 77772, 777770, 7777770, 7777777, 777777776, 777777777, 77777777770, 777777777777, 7777777777776, 77477777777777, 777777777777770, 7777777777777770, 77777777777777776, 177777777777777777
OFFSET
1,1
FORMULA
a(n) = n*A112905(n).
EXAMPLE
a(4) = 77772 because 77772 contains 4 sevens and is divisible by 4.
KEYWORD
base,nonn
AUTHOR
Ray G. Opao, Oct 05 2005
EXTENSIONS
Extended by Ray Chandler, Oct 09 2005
STATUS
approved