this post was submitted on 31 May 2024
21 points (100.0% liked)

Daily Maths Challenges

213 readers
1 users here now

Share your cool maths problems.



Complete a challenge:


Post a challenge:


Feel free to contribute to a series by DMing the OP, or start your own challenge series.

founded 10 months ago
MODERATORS
 

This is related to the the May 16 post, but takes only the prime indexed terms. Does it still diverge?

HintTransform the product into a sum


HintThe harmonic series 1 + 1/2 + 1/3 + ... 1/n +... diverges


you are viewing a single comment's thread
view the rest of the comments
[โ€“] CharlesMangione 6 points 9 months ago* (last edited 9 months ago) (1 children)

I don't know how to begin proving it, but the more I run this series out, bigger it gets. The conditions of the equation are such that it will always have a consistently non-zero rate of increase, even though that rate of increase decreases each time the formula is cycled ((p~n~/p~n~-1) will always be more than (p~n+1~/p~n+1~-1), nonetheless any and every (p~n~/p~n~-1) will be >1). The divergence will be glacial, but definite.

[โ€“] [email protected] 4 points 9 months ago

I can confirm that your intuition for divergence is correct.