Two hundred: That’s quite a few

It’s nice to end the year on a happy note.My favorite Christmas card was this one: “Dr. Hardwicke – Thank you for saving my life!” And I have a new milestone, writing a200th article for The Sun! I’ll just make a bit of a numbers puzzle. What is the one number that keeps appearing in these two adding progressions and three multiplying progressions?Hint: If you mult...

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