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Stirling's approximation of factorial Online calculator computes Stirling's approximation of factorial of given positive integer (up to 170!) |

Combinatorics – combinations, arrangements and permutations This calculator calculates the number of combinations, arrangements and permutations for given n and m |

Combinations generator This combinations calculator generates all possible combinations of m elements from the set of n elements. |

Factor Pairs Generator This calculator generates all pairs of factors for given integer. |

Combinatorics: Permutation Generator with Repetitions Generate permutations with repetitions from n to m elements using this calculator for combinatorial analysis. |

Combinatorics. Permutation generator from n to m without repetitions Combinatorics. Permutation generator from n to m without repetitions |

Gamma function Calculation of the Gamma function using Lanczos approximation |

Generator of combinations that satisfy a condition For elements with weights this calculator can filter out all combinations where total weight is under the specified limit. |

Permutations calculator This online calculator generates all permutations for the specified set of elements. Note that the total number of permutations is the factorial of the number of elements in the set - for a large number of elements, the calculation will take a significant amount of time. |

Factorial This online calculator calculates factorial of a positive integer. Practically unlimited positive integer. In fact, it is limited only by the time you are willing to wait until calculation completes. I was patient enough to wait for 100000! |

Tips and tricks #12: Long (infinite) calculations This article describes how to perform long or infinite calculations while allowing user to stop them |

Division of factorials This online calculator solves factorial division problems when you have factorials in the numerator and denominator. |