Find all solutions to the equation
2n = a! + b! + c!
in positive integers a, b, c and n. Show your proof.
(Here, ! means "factorial" and, if the superscript does not show properly, the left-hand side is 2^n.)
Originally from IrMO 2001 Paper 1 Q1.
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:-)Thanks for the @steemstem upvote - unexpected surprise!
Hahahahahahaha.
Laughing at myself, I should just keep calm and learn from the right answer.
This is back to school for me.