Can you remember this formula and the question behind it? 𝚽=mn−𝚺_(i=1) ^m 𝚺_(j=1) ^n sign[gcd(i,j)−1] The first prize goes to that one who can tell the # of the initial question.


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Question Number 38812 by MrW3 last updated on 30/Jun/18

$C a n y o u r e m e m b e r t h i s f o r m u l a a n d$ $t h e q u e s t i o n b e h i n d i t ?$ $Φ = m n - \underset{i = 1}{\sum^{m}} \underset{j = 1}{\sum^{n}} s i g n [g c d (i, j) - 1]$ $T h e f i r s t p r i z e g o e s t o t h a t o n e w h o$ $You can't use 'macro parameter character #' in math mode$
Commented by MrW3 last updated on 01/Jul/18

$T h i s i s a c a l l f o r F i l u p S m i t h s i r w h o$ $w a s a n a c t i v e m e m b e r i n t h i s f o r u m$ $f o r a l o n g t i m e . B u t s a d l y h e s e e m s t o$ $h a v e l e f t h e r e . H e i s t h e o n e w h o a s k e d$ $t h e q u e s t i o n b e h i n d t h i s f o r m u l a . Y o u$ $m a y f i n d i t i n Q 12883 .$
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