Here is a sequence something like the "hailstone" one : starting from any number, if it is prime, multiply by two and add one, if composite, replace by its largest prime factor. This depends on there being a lot of primes of the form 2p+1 where P is prime. I don't know enough math to know how long those go on, but there are interesting sequencers for up to the 1000th prime.
Add new comment
The COVID-19 pandemic has amplified the differences between us. Understanding these inequalities is crucial for this and future pandemics.
Now it's the turn of mathematicians to help to improve the communities of the future.
There have been accusations that the modelling projecting the course of the pandemic was too pessimistic. Are they justified?
We all know what turbulence is, but nobody understands it.
Find out about the beautifully intuitive concept that lies at the heart of calculus.