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a(n) = 10^n - prime(n).
1

%I #19 Apr 04 2016 23:28:12

%S 8,97,995,9993,99989,999987,9999983,99999981,999999977,9999999971,

%T 99999999969,999999999963,9999999999959,99999999999957,

%U 999999999999953,9999999999999947,99999999999999941,999999999999999939,9999999999999999933

%N a(n) = 10^n - prime(n).

%e a(4) = 10^4-7=9993.

%t Table[10^n - Prime@ n, {n, 19}] (* _Michael De Vlieger_, Mar 24 2016 *)

%o (PARI) a(n) = 10^n - prime(n); \\ _Altug Alkan_, Mar 24 2016

%Y Cf. A000040, A011557, A193825.

%K nonn

%O 1,1

%A _Emre APARI_, Mar 24 2016

%E More terms from _Altug Alkan_, Mar 24 2016