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a(n) is the least positive integer in base 10 containing n sevens that is divisible by n.
1

%I #4 Mar 31 2012 14:11:25

%S 7,770,777,77772,777770,7777770,7777777,777777776,777777777,

%T 77777777770,777777777777,7777777777776,77477777777777,

%U 777777777777770,7777777777777770,77777777777777776,177777777777777777

%N a(n) is the least positive integer in base 10 containing n sevens that is divisible by n.

%F a(n) = n*A112905(n).

%e a(4) = 77772 because 77772 contains 4 sevens and is divisible by 4.

%Y Cf. A112889-A112898, A112900-A112905, A112907-A112910.

%K base,nonn

%O 1,1

%A _Ray G. Opao_, Oct 05 2005

%E Extended by _Ray Chandler_, Oct 09 2005