For loop outputs into Row Vector

I need help to put the outputs of my for loop into a row vector

s =1473687476902629535821802641425569585752815039365228611687

r = 6

a=7

for i=[0:r]

powermod(a,s*2^i,n)

end

Answer 1

[KSSV]

s =1473687476902629535821802641425569585752815039365228611687
r =  6 ;
a = 7 ;  
r = 0:r ; 
iwant = zeros(length(r),1) ; 
for i=1:length(r)
    iwant(i) = powermod(a,s*2^r(i),n)
end

[John D'Errico]

That cannot possibly work, because s is not correctly represented as a double.

Answer 2

[John D'Errico]

You don't say the value of n there. So I'll choose some value.

Next, you need to store s in a form where it will be represneted exactly. You cannot perform huge precision computations using doubles.

s = sym('1473687476902629535821802641425569585752815039365228611687');
r = 6;
a = 7;
n = 17; % my example, so my favorite number
result = zeros(1,r+1,'sym');
for i=[0:r]
   result(i+1) = powermod(a,s*2^i,n);
end

result
result =
[12, 8, 13, 16, 1, 1, 1]