Tag: digits

Interview Questions

• The number equal to the sum of the cubes of its digits
• The book that took 792 digits to number
• The number that rotates when multiplied
• The sum of all digits from 1 to a million
• The biggest digit sum a 24-hour clock ever shows
• Eight eights that add to a thousand
• The number that equals the sum of the factorials of its digits
• Four fours from zero to ten
• How many times is the digit 1 written from 1 to 1000?
• How many times is the digit 7 written from 1 to 1000?
• Kaprekar's constant, 6174
• Make 100 from the digits 1 to 9 in order
• The four-digit number that reverses when multiplied by four
• Palindromic dates in the 2020s
• Ages that are each other's digits reversed
• The number that describes its own digits
• SEND + MORE = MONEY
• 77, 49, 36, 18, what next?
• 1, 4, 9, 61, 52, 63, 94, what next?
• Writing digits to reach a multiple of nine
• Add up every digit from 1 to 999
• The 1089 trick
• The nine-digit number whose every prefix divides
• Two-digit numbers that are seven times their digit sum
• The two-digit number that is the square of its digit sum
• TWO + TWO = FOUR