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Question: Cannot map a function with `mod`

Question:Cannot map a function with `mod`

NeraSnow 55 Maple 2022
modp map mod
August 20 2023
0

I am slightly confused as I can't apply the seemingly correct function to a sequence. It seems like modp does not like my inverse. But I am not aware of any other way of finding the modular inverse.  

> 

a := i -> (1025 - 2^(10 - 2^i))^(-1) mod (1025 - 2^(10 - 2*2^i));

proc (i) options operator, arrow; `mod`(1/(1025-2^(10-2^i)), 1025-2^(10-2*2^i)) end proc

 (1)
> 

a(1);

5

 (2)
> 

a(2);

17

 (3)
> 

map(i -> i + 1, {seq(1 .. 4)});

{2, 3, 4, 5}

 (4)
> 

map(i -> 1/(1025 - 2^(10 - 2^i)) mod (1025 - 2^(10 - 2*2^i)), {seq(1 .. 4)});

Error, invalid input: modp received 65599/64, which is not valid for its 2nd argument, m

  
> 

map(a, {seq(1 .. 4)});

Error, invalid input: modp received 65599/64, which is not valid for its 2nd argument, m

  

NULL

NULL

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