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A097429 Integer part of the radii of circles with prime areas. 0
0, 0, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,6

LINKS

Table of n, a(n) for n=2..92.

FORMULA

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

EXAMPLE

If A = 5. floor(sqrt(5/Pi)) = 1, the third entry.

PROG

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

CROSSREFS

Sequence in context: A003058 A000194 A168255 * A100617 A076471 A165116

Adjacent sequences:  A097426 A097427 A097428 * A097430 A097431 A097432

KEYWORD

nonn

AUTHOR

Cino Hilliard, Aug 22 2004

STATUS

approved

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Last modified February 18 23:26 EST 2018. Contains 299330 sequences. (Running on oeis4.)