A202306 a(n) = floor(sqrt(7*n)).

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, 14, 14, 14, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 16, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 19, 19, 19, 19, 19, 19, 20, 20, 20, 20, 20, 21, 21, 21, 21, 21, 21

Offset: 0

Author

Vincenzo Librandi, Jan 17 2012

Keywords

• nonn
• easy

Links

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

Crossrefs

Cf. A172471, A202304, A202305.

Programs

Magma

[Floor(Sqrt(7*n)) : n in [0..80]];

Mathematica

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

PARI

a(n)=sqrtint(7*n) \\ Charles R Greathouse IV, Jan 17 2012

Formula

a(n) = A000196(7*n).