Files
ioccc/2000/bellard
Landon Curt Noll 1878ea0f72 fix topbar menu items
Improved the topbar menu set.

Fixed broken links from the topbar.

Removed "Click this" (for now?).

Ran `make www` to perform the above.
2024-04-23 15:07:14 -07:00
..
2022-09-18 23:37:49 -07:00
2023-07-06 21:49:38 -07:00
2024-04-23 15:07:14 -07:00
2024-03-13 00:38:46 -07:00

To build:

    make

To use:

    ./bellard

Judges' remarks:

This code is a nice compact example of a Modular Fast Fourier Transform. While its output is very specific, the internal FFT has a wide variety of uses.

Can you modify this code to produce primes such as 23523*2^70000-1, 48594^65536+1 or 6917!-1?

NOTE: as bigger primes are found as time goes by this program no longer prints the biggest prime once noted by the author below.

Author's comments:

This program prints the biggest known prime number (2^6972593-1) in base 10. It requires a few minutes. It uses a Modular Fast Fourier Transform to compute this number in a reasonable amount of time (the usual method would take ages !).

The program uses >= 64 bit long long type. It should run on any system with a gcc compiler.