Every other odd number representation

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Discussion Overview

The discussion revolves around finding a formula that generates every other odd number, specifically the sequence 1, 5, 9, 13, etc. Participants explore various mathematical expressions and reasoning related to this sequence.

Discussion Character

  • Exploratory, Mathematical reasoning, Debate/contested

Main Points Raised

  • One participant inquires about a formula for every other odd number, seeking a specific sequence.
  • Another participant suggests the formula 2n - 1 for generating odd numbers, but this does not address the "every other" aspect.
  • A different participant proposes the formula 4n - 3, questioning if it is correct.
  • One participant hints at a relationship between the general form "2n + something" and the desired sequence, suggesting that a series separated by 4 could be relevant.
  • Another confirms that 4n - 3 is indeed the correct formula for the sequence of every other odd number, while noting that 4n - 1 generates a different series of odd numbers.
  • A participant observes that multiple contributors arrived at similar conclusions in a short time frame.

Areas of Agreement / Disagreement

Participants generally agree on the formula 4n - 3 for generating every other odd number, but there is some initial confusion and debate regarding the correct approach.

Contextual Notes

The discussion includes varying interpretations of what constitutes "every other odd number" and the relationship between different mathematical expressions. Some assumptions about the definitions of odd numbers and sequences may not be explicitly stated.

gfd43tg
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Hello,

Is there any formula that describes every other odd number, for ##n = 1,2,\dots##? I can't seem to find anything that does it on the web.

Something that would do 1,5,9,13,...
 
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Try 2n - 1
2n guarantees even
Subtract 1 produces an odd number.
 
yeah but I said every other odd, not every odd
 
4n-3? Or am I missing something really obvious?
 
If "2n + something" gives a series of numbers separated by 2, what do you think gives a series separated by 4?

EDIT: Oh well, I was trying to get you to think it out for yourself, but somebody else just told you the answer.
 
Then 4n- 3 of course. (4n- 1 gives the other odd numbers, 3, 7, 11, etc.)
 
Note that the last three of us, essentially saying the same thing, posted within 2 minutes!
 

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