What is a 9 digit number using digits 1-9 that is divisible by 9, if you take away the last digit is divisible by 8 etc
you can build this up from the left
one such number is
123654321
1236543219=13739369
123654328=1545679
12365437=176649
1236546=20609
123655=2473
12364=309
1233=41
122=6
11=1
if you just work this backwards you can see how it's constructed. Just make sure your condition is met each time you add a new digit.
you can build this up from the left
one such number is
123654321
1236543219=13739369
123654328=1545679
12365437=176649
1236546=20609
123655=2473
12364=309
1233=41
122=6
11=1
if you just work this backwards you can see how it's constructed. Just make sure your condition is met each time you add a new digit.