How to apply a function on a number which is in 'sym' format?

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p = sym('2')^100 - 15;
results = p_inverse(p-1, p);
where the function p_inverse is defined as;
function ia = p_inverse(a, p)
[~,ia] = gcd(a,p);
end
How can I find p_inverse for such p as defined above?

Accepted Answer

Walter Roberson
Walter Roberson on 21 Feb 2022
p = sym('2')^100 - 15;
results = p_inverse(p-1, p)
results = 
1267650600228229401496703205360
mod(results * (p-1),p)
ans = 
1
function inv = p_inverse(a, p)
[~, ia] = gcd(a,p);
inv = mod(ia, p);
end

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