A017927 - OEIS

%I #16 Sep 08 2022 08:44:43

%S 1,3,7,19,49,130,343,908,2401,6353,16807,44468,117649,311270,823543,

%T 2178890,5764801,15252230,40353607,106765609,282475249,747359261,

%U 1977326743,5231514823,13841287201,36620603759

%N Powers of sqrt(7) rounded up.

%H Vincenzo Librandi, <a href="/A017927/b017927.txt">Table of n, a(n) for n = 0..1000</a>

%t Ceiling[(Sqrt[7])^Range[0,40]] (* _Vincenzo Librandi_, Nov 21 2011 *)

%o (Magma) [Ceiling(Sqrt(7^n)): n in [0..30]]; // _Vincenzo Librandi_, Nov 21 2011

%o (PARI) a(n)=ceil(sqrt(7)^n) \\ _Charles R Greathouse IV_, Nov 21 2011

%K nonn

%O 0,2

%A _N. J. A. Sloane_