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10^n*(7+3*10^n)+3.
0

%I #4 Dec 15 2017 17:37:10

%S 13,373,30703,3007003,300070003,30000700003,3000007000003,

%T 300000070000003,30000000700000003,3000000007000000003,

%U 300000000070000000003,30000000000700000000003,3000000000007000000000003,300000000000070000000000003,30000000000000700000000000003

%N 10^n*(7+3*10^n)+3.

%t Table[10^n*(7+3*10^n)+3,{n,0,20}] (* _Harvey P. Dale_, Mar 01 2017 *)

%K easy,nonn

%O 0,1

%A _Jason Earls_, Dec 14 2009

%E More terms from _Harvey P. Dale_, Mar 01 2017