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%I #14 Jun 17 2017 03:56:11
%S 7,47,447,4447,44447,444447,4444447,44444447,444444447,4444444447,
%T 44444444447,444444444447,4444444444447,44444444444447,
%U 444444444444447,4444444444444447,44444444444444447,444444444444444447
%N (4*10^n + 23)/9.
%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (11,-10).
%F a(n) = 10*a(n-1)-23 with n>1, a(1)=7.
%F a(n) = 11*a(n-1)-10*a(n-2). G.f.: -x*(30*x-7)/((x-1)*(10*x-1)). [_Colin Barker_, Jan 24 2013]
%t LinearRecurrence[{11,-10},{7,47},30] (* or *) Table[FromDigits[ PadLeft[ {7},n,4]],{n,30}] (* _Harvey P. Dale_, Dec 27 2014 *)
%o (PARI) a(n)=4*10^n\9+3 \\ _Charles R Greathouse IV_, Jan 11 2012
%K nonn,easy
%O 1,1
%A _Vincenzo Librandi_, Feb 24 2010
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