What Defines the Nth Prime Number in Mathematics?

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Discussion Overview

The discussion revolves around the concept of a general term in sequences, specifically focusing on the sequence of prime numbers and whether it has a defined general term. Participants explore definitions and implications of sequences in mathematics.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions whether every sequence has a general term and seeks a definition of what that entails.
  • Another participant defines a sequence as a function with natural numbers as its domain and states that the general term is represented as an.
  • A participant asks for clarification on the definition of a sequence.
  • There is a query about the possibility of representing all terms of a sequence through its general term.
  • One participant provides an example of the prime number sequence and questions if it has a general term.
  • Another participant asserts that there is no straightforward formula for the nth prime number, other than stating it as "an is the nth prime."
  • A request for a mathematical definition of the general term is made, seeking further explanation.
  • One participant claims that "the nth prime" serves as a mathematical definition that uniquely identifies the number, suggesting that this suffices for mathematical purposes.

Areas of Agreement / Disagreement

Participants express differing views on whether a general term can be defined for the sequence of prime numbers. Some assert that it cannot be represented by a straightforward formula, while others argue that the definition of "the nth prime" is sufficient.

Contextual Notes

The discussion includes assumptions about the nature of sequences and the definitions involved, which may not be universally agreed upon. The lack of a consensus on the existence of a general term for the prime number sequence remains unresolved.

grupah
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Dear Forum,

Does every sequence have a general term? What is the definition of the general term of a sequence?

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hi grupah! :smile:

a sequence is a function whose domain is the natural numbers (or a subset of them)

so we can write it as {an}nεN,

and the general term of the sequence is an :wink:

(if you mean is there a straightforward formula for an, the answer is not necessarily, it depends how the sequence is defined)
 
What is your definition of sequence, exactly?
 
Is it possible to represent all the terms of the sequence by the general term?
 
i don't understand :confused:

can you give an example of what you're thinking of?​
 
Consider the sequence of prime numbers: {2,3,5,7,dots}
Does it have a general term?
 
grupah said:
Consider the sequence of prime numbers: {2,3,5,7,dots}
Does it have a general term?

no, there's no formula (other than "an is the nth prime")
 
So, what is the mathematical definition of the general term, a kind of explanation?
 
"the nth prime" is a mathematical definition!

it uniquely defines the number, and that's all maths requires :smile:
 

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