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a(n) = ceiling(n*sqrt(10)).
1

%I #12 Sep 10 2023 21:03:19

%S 0,4,7,10,13,16,19,23,26,29,32,35,38,42,45,48,51,54,57,61,64,67,70,73,

%T 76,80,83,86,89,92,95,99,102,105,108,111,114,118,121,124,127,130,133,

%U 136,140,143,146,149,152,155,159,162,165,168,171

%N a(n) = ceiling(n*sqrt(10)).

%H Vincenzo Librandi, <a href="/A198265/b198265.txt">Table of n, a(n) for n = 0..10000</a>

%t Ceiling[Sqrt[10]Range[0,60]] (* _Harvey P. Dale_, Apr 23 2015 *)

%o (Magma) [Ceiling(n*Sqrt(10)): n in [0..60]]

%Y Cf. A177102.

%K nonn

%O 0,2

%A _Vincenzo Librandi_, Oct 24 2011