A202305 - OEIS

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A202305

a(n) = floor(sqrt(5*n)).

4

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

(list; graph; refs; listen; history; text; internal format)

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