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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. |

Factoring calculator This calculator generates all pairs of factors for given integer. |

Combinatorics. Permutation generator from N to M with repetitions. Combinatorics. Permutation generator from N to M with repetitions. |

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. |

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. |