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 Dec19 awarded Caucus Oct11 comment Why do some mathematical ideas seem counter-intuitive? @AsafKaragila I is an engineer; pretty sure ignoring the actual question and nitpicking the small mistakes is right there in my job description Oct10 answered Why do some mathematical ideas seem counter-intuitive? Apr28 awarded Teacher Apr28 answered A function such that $f(f(n)) = -n$? Jun19 awarded Scholar Jun19 accepted can all triangle numbers that are squares be expressed as sum of squares Jun19 comment can all triangle numbers that are squares be expressed as sum of squares correct... any suggestions on how to correct the title? Jun19 awarded Student Jun19 asked can all triangle numbers that are squares be expressed as sum of squares May17 comment Fermat Last Theorem for non Integer Exponents Do you have an example for n rational and > 2? Feb17 comment Proof of the formula for Euler's totient function This was mentioned in one or more answers, but just to restate as a comment: the totient function is not always the product of one less than the prime factors; if a number has n multiples of the same prime factor, you use p^n - p^(n-1); in the case where n==1, you would use p - p^0 which is p - 1. Nov3 comment Father and daughter river crossing puzzle. Another variant (Italian I think) relaxes constraint 3 to allow the case where the man won't ravish someone's sister if his sister is also present as a chaperone) Aug3 awarded Supporter