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a(n) = ceiling(7^n/n).
1

%I #12 Sep 08 2022 08:45:30

%S 7,25,115,601,3362,19609,117649,720601,4483735,28247525,179756977,

%T 1153440601,7453000801,48444505204,316504100663,2077058160601,

%U 13684147881601,90467422106137,599941851861745,3989613314880601

%N a(n) = ceiling(7^n/n).

%H Vincenzo Librandi, <a href="/A129791/b129791.txt">Table of n, a(n) for n = 1..1000</a>

%t Table[Ceiling[7^n/n],{n,20}] (* _Harvey P. Dale_, May 22 2020 *)

%o (Magma) [Ceiling(7^n/n):n in [1..20]]; // _Vincenzo Librandi_, Oct 03 2011

%Y Cf. A053638.

%K nonn,easy

%O 1,1

%A _Mohammad K. Azarian_, May 18 2007