A097430 - OEIS

A097430

Integer part of the radii of circles with area n.

0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5

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OFFSET

1,13

LINKS

Table of n, a(n) for n=1..105.

FORMULA

Radius = floor(sqrt(Area/Pi)).

EXAMPLE

If A = 4. floor(sqrt(4/Pi)) = 1, the 4th entry.

PROG

(PARI) f(n) = for(x=1, n, print1(floor(sqrt(x/Pi))", "))

CROSSREFS