A022850 Integer nearest n*x, where x = sqrt(7).

0, 3, 5, 8, 11, 13, 16, 19, 21, 24, 26, 29, 32, 34, 37, 40, 42, 45, 48, 50, 53, 56, 58, 61, 63, 66, 69, 71, 74, 77, 79, 82, 85, 87, 90, 93, 95, 98, 101, 103, 106, 108, 111, 114, 116, 119, 122, 124, 127, 130, 132, 135, 138, 140, 143, 146, 148, 151, 153, 156

Offset: 0

Author

Clark Kimberling

Keywords

• nonn
• easy

Links

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

Crossrefs

Cf. A022841.

Programs

Magma

[Round(n*Sqrt(7)): n in [0..60]]; // Vincenzo Librandi, Oct 24 2011

Mathematica

Table[Round[n*Sqrt[7]], {n,0,60}] (* G. C. Greubel, Sep 29 2018 *)

PARI

vector(60, n, n--; round(n*sqrt(7))) \\ G. C. Greubel, Sep 29 2018

Python

from math import isqrt
def A022850(n): return (m:=isqrt(k:=7*n*n))+int(k-m*(m+1)>=1) # Chai Wah Wu, Jul 31 2022