Danny Gregory (Everday Matters) is offering some nice prizes for the best illustrated letters he receives before Christmas.
I think this is a fun idea!
BrainTwister #57: Prime jumps
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From New Scientist #3527, 25th January 2025 [link] [link] If we start with
21 (which isn’t a prime number), how many times do we have to add 100
before we ...
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