Sprimer for Windows

Name: Sprimer
Rating: 4.5 (8 reviews)
Author: Blackhat Software

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Used Sprimer for Windows?

Editors’ Review

Download.com staffFebruary 26, 2026

Sprimer graphically plots prime numbers on a grid, spiraling outward. Primes appear white against a black background, revealing potential patterns. It supports centers up to 1,000,000.

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Free

Pros
- Visualizes prime numbers on a spiral grid.
- Highlights prime numbers in white.
- Masks non-prime numbers in black.
- Supports center numbers from 1 to 1,000,000.
- Develops diagonal line patterns with specific centers.
Cons
- Searches for a prime number pattern, none is known.
- No explicit mention of outputting found patterns.

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Full Specifications

GENERAL

Release: November 13, 2001

Latest update: February 26, 2026

Version: 1.0

OPERATING SYSTEMS

Platform: Windows

Operating System

Windows 10
Windows 98
Windows NT
Windows ME
Windows XP

Additional Requirements: Windows 98/Me/NT/XP

POPULARITY

Total Downloads: 3,986

Downloads Last Week: 0

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User Reviews

4.5/5

8 User Votes

Great toy for people fascinated with prime numbers.
matthew_of_cambridgeJune 28, 2007
Pros
Fun for the mathematically inclined. Quite intriguing.
Cons
Don't download this if you're not a math-o-phile. You'll find it pointless.
Summary
kulvirNovember 21, 2004
Pros
Cons
Summary
Great Prog but error in description.
October 12, 2003
Pros
Cons
Summary
The program describes the plot of numbers as a clockwise spiral but indeed the spiral is counterclockwise going right, down, left, up, etc.
Math mania
February 4, 2002
Pros
Cons
Summary
Prime numbers? Pattern? Who knew?
If you like math, you'll love this.
February 1, 2002
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Cons
Summary
If you're into prime numbers, then check this out. Other cool stuff at that site too.
Cool
January 29, 2002
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Summary
Other cool things at that website.
Interesting
January 5, 2002
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Cons
Summary
Type in a number and you get a pattern for it. Fun to play with.
This is the Publisher
December 10, 2001
Pros
Cons
Summary
I know the link is broken and I've contacted CNET about correcting it. In the meantime, simply click the words BLACKHAT SOFTWARE where it says Publisher to be taken to my site where you CAN download it for free. Sorry for the trouble. - Dan

Developer’s Description

By Blackhat Software

Search for a pattern to prime numbers.

Sprimer is a mathematical oddity. This program is designed to search for a pattern to prime numbers. Currently, no known pattern exists. The program does this by plotting numbers on a grid and spiraling outward as in the example below. Only numbers that are prime will be seen, highlighted in white. All other numbers will be masked in black. The center of the spiral will be in blue. A pattern of diagonal lines will develop, especially when the number 41 is chosen as the center. This program can graphically plot prime numbers with a center number ranging from 1 to 1,000,000.

Sprimer for Windows

Editors’ Review

Top Recommended Alternative

Scientific Notation Converter

Pros

Cons