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A067561
Radii n of circles with integer radius that can approximately be squared integrally: the floor or ceiling of Pi*n^2 is an integer square.
1
1, 22, 167, 334, 4821, 328663, 657326, 18796631, 37593262, 56389893, 75186524, 1591338537
OFFSET
1,2
COMMENTS
a(13) > 5*10^9. - Sean A. Irvine, Dec 19 2023
EXAMPLE
Ceiling(Pi*22^2) = 39^2, so 22 is a term of the sequence.
MATHEMATICA
Do[m = Pi*i^2; r = IntegerQ[Sqrt[Floor[m]]]; s = IntegerQ[Sqrt[Ceiling[m]]]; If[r || s, Print[i]], {i, 1, 10^6}]
CROSSREFS
Sequence in context: A185859 A173393 A141306 * A223768 A224156 A223775
KEYWORD
nonn,more
AUTHOR
Joseph L. Pe, Jan 29 2002
EXTENSIONS
More terms from Jason Earls, May 19 2002
a(12) from Sean A. Irvine, Dec 19 2023
STATUS
approved