Another What's the next number?

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Discussion Overview

The discussion revolves around a sequence of numbers and the challenge of determining the next number in the series. Participants explore various mathematical patterns and hypotheses related to the sequence, which includes both numerical and algebraic reasoning.

Discussion Character

  • Exploratory, Mathematical reasoning, Debate/contested

Main Points Raised

  • One participant presents a sequence: 1, 9, 625, 117649, 531441, 25937424601, 23298085122481, 2562890625, and poses the question of the next number.
  • Another participant suggests that the sequence could be represented by the formula (2x+1)^2x for x=0,1,2,3, but notes that the 5th and 8th numbers complicate this hypothesis.
  • Further contributions from the same participant provide specific values for x, indicating that for x=8, the result is 1716, and for x=9, it is 1918, while also mentioning a different result for x=10.
  • There is a mention of an additional trick that might apply to the sequence, though details are not fully elaborated.

Areas of Agreement / Disagreement

Participants express differing views on the formula that could describe the sequence, indicating that no consensus has been reached regarding the next number or the underlying pattern.

Contextual Notes

The discussion includes assumptions about the nature of the sequence and the applicability of proposed formulas, which may not have been fully verified or agreed upon by all participants.

holomorphic
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Another "What's the next number?"

Someone posted one of these recently and I just felt like putting up some recklessly-devised next number question of my own. I like these!

So, what is it?

1, 9, 625, 117649, 531441, 25937424601, 23298085122481, 2562890625, ...?
 
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Well, if it wasn't for the 5th and 8th one, I would say it was (2x+1)^2x for x=0,1,2,3...
 


transphenomen said:
Well, if it wasn't for the 5th and 8th one, I would say it was (2x+1)^2x for x=0,1,2,3...

this.

so, the guess would be:

x = 8 => 1716 = 48,661,191,875,666,868,481
 


Dickfore said:
this.

so, the guess would be:

x = 8 => 1716 = 48,661,191,875,666,868,481

and x = 9 => 1918 as well, but

for x = 10 you get 7355827511386641 =2112
 


transphenomen said:
Well, if it wasn't for the 5th and 8th one, I would say it was (2x+1)^2x for x=0,1,2,3...

Yeah, aside from the odd bases, there's just one more trick.
 

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