Sjmarf to People [email protected] • 1 day agoIt looks so wrongsh.itjust.worksmessage-square51fedilinkarrow-up1530
arrow-up1530imageIt looks so wrongsh.itjust.worksSjmarf to People [email protected] • 1 day agomessage-square51fedilink
minus-squareElvith Ma'forlinkfedilink19•1 day agoThe digit sum of 51 is 6, which is divisible by three. So 51 is also divisible by three. It’s not even hard to see that it’s not prime.
minus-square@[email protected]linkfedilink10•edit-25 hours agoYup, my personal prime check is: Even? Ends in 5? Digits sum to 3? If it fails all three and it’s not an “obvious” prime (<20), then it’s prime enough for me.
minus-square@[email protected]linkfedilink2•11 hours agoAlso Ends in 0, but that’s covered by 5 really.
The digit sum of 51 is 6, which is divisible by three. So 51 is also divisible by three. It’s not even hard to see that it’s not prime.
Yup, my personal prime check is:
If it fails all three and it’s not an “obvious” prime (<20), then it’s prime enough for me.
Also
Ends in 0,
but that’s covered by 5 really.
It’s also covered by being even.