Can-you-remember-this-formula-and-the-question-behind-it-mn-i-1-m-j-1-n-sign-gcd-i-j-1-The-first-prize-goes-to-that-one-who-can-tell-the-of-the-initial-question-

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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