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Prime Number Spiral

Prime Number Spiral 9.00 updated

The Prime Number Spiral (a.k.a. the Ulam Spiral) is constructed as follows: Consider a rectangular grid. We start with the central point and arrange the positive integers in a spiral fashion (anticlockwise). The prime numbers are then marked. There is a...

Quick Conversion

Quick Conversion 10.3 updated

Lite version converts several units of length. Plus version converts length, weight and capacity measures. By typing a number into box provided will instantly display the results without the user having to search through a confusing menu of choices. Great...

Chinese Calendrics

Chinese Calendrics 14.52 updated

A program to convert between dates in Chinese, Vietnamese and Japanese lunar calendars and dates in the Gregorian and Julian calendars, and to find lunar new year's day and leap months for any year in the Asian calendars. Can list anniversaries of lunar...

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Factorizer

Factorizer 12.00 updated

Factorizer is a Windows program to find factors of numbers up to 2,147,483,646 and to find primes, pairs of primes and Palmen colors of numbers. Or in more detail, Factorizer may be used: (1) to get the prime decomposition of all numbers in a range of...

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