# Euler problems/121 to 130

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[[Category:Programming exercise spoilers]] | [[Category:Programming exercise spoilers]] | ||

− | == [http://projecteuler.net/index.php?section= | + | == [http://projecteuler.net/index.php?section=view&id=121 Problem 121] == |

Investigate the game of chance involving coloured discs. | Investigate the game of chance involving coloured discs. | ||

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</haskell> | </haskell> | ||

− | == [http://projecteuler.net/index.php?section= | + | == [http://projecteuler.net/index.php?section=view&id=122 Problem 122] == |

Finding the most efficient exponentiation method. | Finding the most efficient exponentiation method. | ||

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</haskell> | </haskell> | ||

− | == [http://projecteuler.net/index.php?section= | + | == [http://projecteuler.net/index.php?section=view&id=123 Problem 123] == |

Determining the remainder when (pn − 1)n + (pn + 1)n is divided by pn2. | Determining the remainder when (pn − 1)n + (pn + 1)n is divided by pn2. | ||

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</haskell> | </haskell> | ||

− | == [http://projecteuler.net/index.php?section= | + | == [http://projecteuler.net/index.php?section=view&id=124 Problem 124] == |

Determining the kth element of the sorted radical function. | Determining the kth element of the sorted radical function. | ||

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</haskell> | </haskell> | ||

− | == [http://projecteuler.net/index.php?section= | + | == [http://projecteuler.net/index.php?section=view&id=125 Problem 125] == |

Finding square sums that are palindromic. | Finding square sums that are palindromic. | ||

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</haskell> | </haskell> | ||

− | == [http://projecteuler.net/index.php?section= | + | == [http://projecteuler.net/index.php?section=view&id=126 Problem 126] == |

Exploring the number of cubes required to cover every visible face on a cuboid. | Exploring the number of cubes required to cover every visible face on a cuboid. | ||

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</haskell> | </haskell> | ||

− | == [http://projecteuler.net/index.php?section= | + | == [http://projecteuler.net/index.php?section=view&id=127 Problem 127] == |

Investigating the number of abc-hits below a given limit. | Investigating the number of abc-hits below a given limit. | ||

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</haskell> | </haskell> | ||

− | == [http://projecteuler.net/index.php?section= | + | == [http://projecteuler.net/index.php?section=view&id=128 Problem 128] == |

Which tiles in the hexagonal arrangement have prime differences with neighbours? | Which tiles in the hexagonal arrangement have prime differences with neighbours? | ||

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</haskell> | </haskell> | ||

− | == [http://projecteuler.net/index.php?section= | + | == [http://projecteuler.net/index.php?section=view&id=129 Problem 129] == |

Investigating minimal repunits that divide by n. | Investigating minimal repunits that divide by n. | ||

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</haskell> | </haskell> | ||

− | == [http://projecteuler.net/index.php?section= | + | == [http://projecteuler.net/index.php?section=view&id=130 Problem 130] == |

Finding composite values, n, for which n−1 is divisible by the length of the smallest repunits that divide it. | Finding composite values, n, for which n−1 is divisible by the length of the smallest repunits that divide it. | ||

## Revision as of 10:31, 20 July 2007

## Contents |

## 1 Problem 121

Investigate the game of chance involving coloured discs.

Solution:

problem_121 = undefined

## 2 Problem 122

Finding the most efficient exponentiation method.

Solution:

problem_122 = undefined

## 3 Problem 123

Determining the remainder when (pn − 1)n + (pn + 1)n is divided by pn2.

Solution:

problem_123 = undefined

## 4 Problem 124

Determining the kth element of the sorted radical function.

Solution:

problem_124 = undefined

## 5 Problem 125

Finding square sums that are palindromic.

Solution:

problem_125 = undefined

## 6 Problem 126

Exploring the number of cubes required to cover every visible face on a cuboid.

Solution:

problem_126 = undefined

## 7 Problem 127

Investigating the number of abc-hits below a given limit.

Solution:

problem_127 = undefined

## 8 Problem 128

Which tiles in the hexagonal arrangement have prime differences with neighbours?

Solution:

problem_128 = undefined

## 9 Problem 129

Investigating minimal repunits that divide by n.

Solution:

problem_129 = undefined

## 10 Problem 130

Finding composite values, n, for which n−1 is divisible by the length of the smallest repunits that divide it.

Solution:

problem_130 = undefined