Sequence of circumscribed Cartesian coordinates

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Discussion Overview

The discussion revolves around the sequence of integer Cartesian coordinates (x, y) that lie within circles of increasing whole number radii centered at the origin. Participants explore the mathematical properties and potential formulas related to this sequence.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant inquires about the sequence of integer coordinates within circles of whole number radii.
  • Another participant finds the problem more complex than initially expected and expresses enjoyment of the challenge.
  • A third participant identifies the problem as the Gauss Circle Problem and references specific sequences that relate to how boundaries are handled, noting the absence of an explicit formula.
  • There is mention of sum representations found in a MathWorld article, but no consensus on a definitive formula is reached.

Areas of Agreement / Disagreement

Participants do not reach a consensus on an explicit formula for the sequence, and multiple perspectives on handling the boundaries of the circles are presented.

Contextual Notes

The discussion does not resolve the mathematical complexities involved in deriving an explicit formula or the implications of boundary handling in the context of the Gauss Circle Problem.

Loren Booda
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What is the sequence described by the counts of integer Cartesian coordinates (x, y) within circles of successive whole number radii centered at the origin?
 
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Hmm..it was trickier than I thought to get out an explicit formula.
Nice problem! :smile:
 
It's the Gauss Circle Problem, with values http://www.research.att.com/~njas/sequences/A000328 or http://www.research.att.com/~njas/sequences/A051132 depending on how you handle the boundaries. I don't have an explicit formula for this myself, though the MathWorld article has a few sum representations.
 
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Thanks for your alertness, both.
 

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