Coding Challenges

Checkout the different challenges below to help sharpen your coding abilities!

Problem 1
Multiples of 3 or 5
Problem 2
Even Fibonacci numbers
Problem 3
Largest prime factor
Problem 4
Largest palindrome product
Problem 5
Smallest multiple
Problem 6
Sum square difference
Problem 7
10001st prime
Problem 8
Largest product in a series
Problem 9
Special Pythagorean triplet
Problem 10
Summation of primes
Problem 11
Largest product in a grid
Problem 12
Highly divisible triangular number
Problem 13
Large sum
Problem 14
Longest Collatz sequence
Problem 15
Lattice paths
Problem 16
Power digit sum
Problem 17
Number letter counts
Problem 18
Maximum path sum I
Problem 19
Counting Sundays
Problem 20
Factorial digit sum
Problem 21
Amicable numbers
Problem 22
Names scores
Problem 23
Non-abundant sums
Problem 24
Lexicographic permutations
Problem 25
1000-digit Fibonacci number
Problem 26
Reciprocal cycles
Problem 27
Quadratic primes
Problem 28
Number spiral diagonals
Problem 29
Distinct powers
Problem 30
Digit fifth powers
Problem 1
Multiples of 3 or 5
Problem 31
Coin sums
Problem 32
Pandigital products
Problem 33
Digit cancelling fractions
Problem 34
Digit factorials
Problem 35
Circular primes
Problem 36
Double-base palindromes
Problem 37
Truncatable primes
Problem 38
Pandigital multiples
Problem 39
Integer right triangles
Problem 40
Champernowne's constant
Problem 41
Pandigital prime
Problem 42
Coded triangle numbers
Problem 43
Sub-string divisibility
Problem 44
Pentagon numbers
Problem 45
Triangular, pentagonal, and hexagonal
Problem 46
Goldbach's other conjecture
Problem 47
Distinct primes factors
Problem 48
Self powers
Problem 49
Prime permutations
Problem 50
Consecutive prime sum
Problem 51
Prime digit replacements
Problem 52
Permuted multiples
Problem 53
Combinatoric selections
Problem 54
Poker hands
Problem 55
Lychrel numbers
Problem 56
Powerful digit sum
Problem 57
Square root convergents
Problem 67
Maximum path sum II
Problem 58
Spiral primes
Problem 59
XOR decryption
Problem 60
Prime pair sets
Problem 61
Cyclical figurate numbers
Problem 62
Cubic permutations
Problem 63
Powerful digit counts
Problem 64
Odd period square roots
Problem 65
Convergents of e
Problem 66
Diophantine equation
Problem 68
Magic 5-gon ring
Problem 1
Multiples of 3 or 5
Problem 2
Even Fibonacci numbers
Problem 3
Largest prime factor
Problem 4
Largest palindrome product
Problem 5
Smallest multiple
Problem 6
Sum square difference
Problem 7
10001st prime
Problem 8
Largest product in a series
Problem 9
Special Pythagorean triplet
Problem 10
Summation of primes
Problem 11
Largest product in a grid
Problem 12
Highly divisible triangular number
Problem 13
Large sum
Problem 14
Longest Collatz sequence
Problem 15
Lattice paths
Problem 16
Power digit sum
Problem 17
Number letter counts
Problem 18
Maximum path sum I
Problem 19
Counting Sundays
Problem 20
Factorial digit sum
Problem 21
Amicable numbers
Problem 22
Names scores
Problem 23
Non-abundant sums
Problem 24
Lexicographic permutations
Problem 25
1000-digit Fibonacci number
Problem 26
Reciprocal cycles
Problem 27
Quadratic primes
Problem 28
Number spiral diagonals
Problem 29
Distinct powers
Problem 30
Digit fifth powers
Problem 31
Coin sums
Problem 32
Pandigital products
Problem 33
Digit cancelling fractions
Problem 34
Digit factorials
Problem 35
Circular primes
Problem 36
Double-base palindromes
Problem 37
Truncatable primes
Problem 38
Pandigital multiples
Problem 39
Integer right triangles
Problem 40
Champernowne's constant
Problem 41
Pandigital prime
Problem 42
Coded triangle numbers
Problem 43
Sub-string divisibility
Problem 44
Pentagon numbers
Problem 45
Triangular, pentagonal, and hexagonal
Problem 46
Goldbach's other conjecture
Problem 47
Distinct primes factors
Problem 48
Self powers
Problem 49
Prime permutations
Problem 50
Consecutive prime sum
Problem 51
Prime digit replacements
Problem 52
Permuted multiples
Problem 53
Combinatoric selections
Problem 54
Poker hands
Problem 55
Lychrel numbers
Problem 56
Powerful digit sum
Problem 78
Coin partitions
Problem 57
Square root convergents
Problem 58
Spiral primes
Problem 59
XOR decryption
Problem 60
Prime pair sets
Problem 61
Cyclical figurate numbers
Problem 62
Cubic permutations
Problem 63
Powerful digit counts
Problem 64
Odd period square roots
Problem 75
Singular integer right triangles
Problem 76
Counting summations
Problem 77
Prime summations
Problem 65
Convergents of e
Problem 66
Diophantine equation
Problem 67
Maximum path sum II
Problem 68
Magic 5-gon ring
Problem 69
Totient maximum
Problem 70
Totient permutation
Problem 71
Ordered fractions
Problem 72
Counting fractions
Problem 73
Counting fractions in a range
Problem 74
Digit factorial chains
Problem 2
Even Fibonacci numbers
Problem 3
Largest prime factor
Problem 4
Largest palindrome product
Problem 5
Smallest multiple
Problem 6
Sum square difference
Problem 7
10001st prime
Problem 8
Largest product in a series
Problem 9
Special Pythagorean triplet
Problem 10
Summation of primes
Problem 11
Largest product in a grid
Problem 12
Highly divisible triangular number
Problem 13
Large sum
Problem 14
Longest Collatz sequence
Problem 15
Lattice paths
Problem 16
Power digit sum
Problem 17
Number letter counts
Problem 31
Coin sums
Problem 18
Maximum path sum I
Problem 19
Counting Sundays
Problem 20
Factorial digit sum
Problem 21
Amicable numbers
Problem 22
Names scores
Problem 23
Non-abundant sums
Problem 24
Lexicographic permutations
Problem 25
1000-digit Fibonacci number
Problem 26
Reciprocal cycles
Problem 27
Quadratic primes
Problem 28
Number spiral diagonals
Problem 29
Distinct powers
Problem 30
Digit fifth powers
Problem 32
Pandigital products
Problem 33
Digit cancelling fractions
Problem 34
Digit factorials
Problem 35
Circular primes
Problem 36
Double-base palindromes
Problem 37
Truncatable primes
Problem 38
Pandigital multiples
Problem 39
Integer right triangles
Problem 40
Champernowne's constant
Problem 41
Pandigital prime
Problem 42
Coded triangle numbers
Problem 43
Sub-string divisibility
Problem 44
Pentagon numbers
Problem 45
Triangular, pentagonal, and hexagonal
Problem 46
Goldbach's other conjecture
Problem 47
Distinct primes factors
Problem 48
Self powers
Problem 41
Pandigital prime
Problem 49
Prime permutations
Problem 50
Consecutive prime sum
Problem 51
Prime digit replacements
Problem 52
Permuted multiples
Problem 53
Combinatoric selections
Problem 54
Poker hands
Problem 55
Lychrel numbers
Problem 56
Powerful digit sum
Problem 57
Square root convergents
Problem 24
Lexicographic permutations
Problem 58
Spiral primes
Problem 59
XOR decryption
Problem 60
Prime pair sets
Problem 61
Cyclical figurate numbers
Problem 1
Multiples of 3 or 5
Problem 2
Even Fibonacci numbers
Problem 3
Largest prime factor
Problem 4
Largest palindrome product
Problem 5
Smallest multiple
Problem 6
Sum square difference
Problem 7
10001st prime
Problem 8
Largest product in a series
Problem 9
Special Pythagorean triplet
Problem 10
Summation of primes
Problem 11
Largest product in a grid
Problem 12
Highly divisible triangular number
Problem 13
Large sum
Problem 14
Longest Collatz sequence
Problem 15
Lattice paths
Problem 16
Power digit sum
Problem 17
Number letter counts
Problem 18
Maximum path sum I
Problem 19
Counting Sundays
Problem 20
Factorial digit sum
Problem 21
Amicable numbers
Problem 22
Names scores
Problem 23
Non-abundant sums
Problem 25
1000-digit Fibonacci number
Problem 26
Reciprocal cycles
Problem 27
Quadratic primes
Problem 28
Number spiral diagonals
Problem 29
Distinct powers
Problem 30
Digit fifth powers
Problem 31
Coin sums
Problem 32
Pandigital products
Problem 33
Digit cancelling fractions
Problem 34
Digit factorials
Problem 35
Circular primes
Problem 36
Double-base palindromes
Problem 37
Truncatable primes
Problem 38
Pandigital multiples
Problem 39
Integer right triangles
Problem 40
Champernowne's constant
Problem 42
Coded triangle numbers
Problem 43
Sub-string divisibility
Problem 44
Pentagon numbers
Problem 45
Triangular, pentagonal, and hexagonal
Problem 46
Goldbach's other conjecture
Problem 47
Distinct primes factors
Problem 48
Self powers
Problem 49
Prime permutations
Problem 50
Consecutive prime sum
Problem 51
Prime digit replacements
Problem 52
Permuted multiples
Problem 53
Combinatoric selections
Problem 54
Poker hands
Problem 55
Lychrel numbers
Problem 56
Powerful digit sum
Problem 57
Square root convergents
Problem 58
Spiral primes
Problem 59
XOR decryption
Problem 60
Prime pair sets
Problem 61
Cyclical figurate numbers
Problem 62
Cubic permutations
Problem 63
Powerful digit counts
Problem 64
Odd period square roots
Problem 65
Convergents of e
Problem 66
Diophantine equation
Problem 67
Maximum path sum II
Problem 68
Magic 5-gon ring
Problem 69
Totient maximum
Problem 70
Totient permutation
Problem 71
Ordered fractions
Problem 72
Counting fractions
Problem 73
Counting fractions in a range
Problem 74
Digit factorial chains
Problem 75
Singular integer right triangles
Problem 76
Counting summations
Problem 77
Prime summations
Problem 78
Coin partitions