A202306 - OEIS

%I #13 Sep 08 2022 08:46:01

%S 0,2,3,4,5,5,6,7,7,7,8,8,9,9,9,10,10,10,11,11,11,12,12,12,12,13,13,13,

%T 14,14,14,14,14,15,15,15,15,16,16,16,16,16,17,17,17,17,17,18,18,18,18,

%U 18,19,19,19,19,19,19,20,20,20,20,20,21

%N Floor(sqrt(7*n)).

%H Vincenzo Librandi, <a href="/A202306/b202306.txt">Table of n, a(n) for n = 0..10000</a>

%F a(n) = A000196(7n).

%t Table[Floor[Sqrt[7n]],{n,0,80}].

%o (Magma) [Floor(Sqrt(7*n)) : n in [0..80]];\

%o (PARI) a(n)=sqrtint(7*n) \\ _Charles R Greathouse IV_, Jan 17 2012

%Y Cf. A172471, A202304, A202305.

%K nonn,easy

%O 0,2

%A _Vincenzo Librandi_, Jan 17 2012