A202305 Floor(sqrt(5*n)).

0, 2, 3, 3, 4, 5, 5, 5, 6, 6, 7, 7, 7, 8, 8, 8, 8, 9, 9, 9, 10, 10, 10, 10, 10, 11, 11, 11, 11, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 17, 17, 17, 18

Offset

0,2

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..10000

Formula

a(n) = A000196(5n).

Mathematica

Table[Floor[Sqrt[5n]], {n, 0, 80}]

Prog

(Magma) [Floor(Sqrt(5*n)) : n in [0..80]]
(PARI) a(n)=sqrtint(5*n) \\ Charles R Greathouse IV, Jan 17 2012

Crossrefs

Cf. A172471, A202304.

Sequence in context: A253548 A083036 A241920 * A195778 A165706 A242453

Adjacent sequences: A202302 A202303 A202304 * A202306 A202307 A202308

Keyword

nonn,easy

Author

Vincenzo Librandi, Jan 17 2012

Status

approved