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 #119: No two 2s
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From New Scientist #3588, 28th March 2026 [link] [link] There are some
numbers whose digits are all 1s or 2s and that don’t contain two 2s in a
row: for ex...
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