在Excel,在计算 of an integercode>a and a prime p。
(picture taken from Wikipedia)
First, I d like to show the problematic picture in a more readable form. Unfortunately, I wasn t able to edit the original post.
The symbols used are not typical, so it is difficult to transform it into simple text.
Taking into account the Euler s criterion Wikipedia, the following LAMBDA function can be proposed:
LEGENDRE(a,p) : =LAMBDA(a,p, IF(MOD(a,p)=0, 0, IF(MOD(a^((p-1)/2),p)=1, 1, -1)))
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