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10^n*(2+7*10^n)+7.
0

%I #4 Aug 14 2019 16:53:48

%S 16,727,70207,7002007,700020007,70000200007,7000002000007,

%T 700000020000007,70000000200000007,7000000002000000007,

%U 700000000020000000007,70000000000200000000007

%N 10^n*(2+7*10^n)+7.

%t Join[{16},FromDigits/@Table[Join[{7},PadRight[{},n,0],{2},PadRight[{},n,0],{7}],{n,0,10}]] (* _Harvey P. Dale_, Aug 14 2019 *)

%K easy,nonn

%O 0,1

%A _Jason Earls_, Dec 17 2009