Why is my computer omitting a result which online compilers aren't? Also, it is taking 35 seconds to run

In terminal –

PS C:\Users\Paradox\Documents\Prog\C> cd "c:\Users\Paradox\Documents\Prog\C\" ; if ($?) { gcc armstrong.c -o armstrong } ; if ($?) { .\armstrong }
Enter the upper limit for the list of Armstrong Numbers :

Output for 1000 as input:

All-Armstrong number between 1 and 1000 are: 1 2 3 4 5 6 7 8 9 370 371 407

It’s omitting 153.

Also, it’s only taking 35 seconds to print the first statement. Apart from that, it prints final output instantaneously. I am using mingw btw.

Code –

#include <stdio.h>
#include <math.h>
int main()
{
    int n1, a, n2, i, r;
    printf("Enter the upper limit for the list of Armstrong Numbers : ");
    scanf("%d", &n1);
    printf("All-Armstrong number between 1 and %d are: ", n1);
    for (int k = 1; k <= n1; k++)
    {
        a = 0,n2 = k,i=0;
        
        do
        {
            n2/= 10;
            i++;
        } 
        while (n2!= 0);
       
        n2 = k;

        do
        {
            r = n2 % 10;
            a+=pow(r, i);
            n2/= 10;
        } 
        while (n2!= 0);

        if (a == k)
        {
            printf("%d ", a);
        }
    }
}

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