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Integer factorization. Trial division This Integer factorization calculator uses the trial division algorithm to perform interger factorization, also known as prime factorization. |

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

Gaps and missing numbers finder This online calculator helps you find gaps and missing numbers in an integer sequence. |

Quick Sum Calculator This online calculator sums up entered numbers. Any symbol what is not a digit, for example, a space, a comma, a semicolon, etc, serves as a separator. It is useful when you need to sum up several numbers but do not have speadsheet program at hand. Use the dot symbol as separator for the decimal part of the number if you need to. |

The rational number as a fraction This online calculator writes the rational number as a fraction (the ratio of two integers), using the formula of infinite geometric sequence. |

Mod calculator This online calculator performs modulo operation on integers and on doubles as well (because it just returns remainder of division) |

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 |

Range finder This online calculator analyzes integer number sequence and prints all continuous ranges it detects |

Modular exponentiation The calculator performs modular exponentiation of big numbers. |

Bit length The calculator counts number of bits required to represent a number in the binary form. It also displays an input number in binary, octal, decimal, and hex forms. |