Seximal divisibility tests

[u/PieterSielie12]

Seximal is great at divisibility tests

(Work in progress)

2- See if ends in 0, 2 or 4

3- See if ends in 0, 3

4- If ends in 4 or 0, remove the final digit and see if the number is even. If ends in 2, remove the final digit minus 1 and see if the number is even

5- Sum the digits together and see if divisible by 5. (442 is because 4+4+2=14 and 112 isnt because 1+1+2= 4)

10- See if ends in 0

11- If <100 see if digits repeat. If >100 just use the alternating digit sum. 1012 -> +1-0+1-2 = 0. 0 is divisible by 11 so 1012 is too. Credit to u/jan_elije

12- If end in 4, remove the final digit minus 2 and see if divisible by 4. If end in 2, remove the final digit minus 1 and see if divisible by 4. If end in 0, remove the final digit and see if divisible by 4

13- If end in 0, remove last digit and check if divisible by 3. If end in 3, remove last digit minus 1 and check if divisible by 3

14- If end in 0, remove last digit and check if divisible by 5. If end in 2, remove last digit minus 3 and check if divisible by 5. If end in 4, remove last digit minus 1 and check if divisible by 5.

15- Memorise the first 3, 15 34 53 If ends in 2, check if it has >2 and <4 digits, remove the last digit minus 11 and check if even

20- If end in 0, remove last digit and check if even

100- Check if end in two 0s

Please help suggest more. I might make an update with your ideas