• 摘要视图
  • 目录视图

Problem 33 Digit canceling fractions

Problem 32 Pandigital products

Problem 31 Coin sums

Problem 30 Digit fifth powers

Problem 29 Distinct powers

Problem 28 Number spiral diagonals

Problem 27 Quadratic primes

Problem 26 Reciprocal cycles

Problem 25 1000-digit Fibonacci number

Problem 24 Lexicographic permutations

Problem 23 Non-abundant sums

Problem 22 Names scores

Problem 21 Amicable numbers

Problem 20 Factorial digit sum

Problem 19 Counting Sundays