-  PARFAIT: Looks for perfect numbers.

OS: Linux, Dos / Windows, Language: C

Looks for perfect numbers (numbers which divisors (except number itself) other than themself) sum give themself).
Example : 6 divisors are : 1, 2, 3. And 1 + 2 + 3 = 6.

Perfect numbers I've found are : 6, 28, 496, 8128 and 33 550 336.

You can give as parameter a number from which research starts.

Special thanks to Pierre Barbier de Reuille for improving my algorythm, program runs fery fast !...

PARFAIT running:

  flashcode@home> parfait
  Nombre parfait: 6 (1+2+3)
  Nombre parfait: 28 (1+2+4+7+14)
  Nombre parfait: 496 (1+2+4+8+16+31+62+124+248)
  Nombre parfait: 8128 (1+2+4+8+16+32+64+127+254+508+1016+2032+4064)
  Recherche... 105200

  flashcode@home> parfait 33550336
  Nombre parfait: 33550336 (1+2+4+8+16+32+64+128+256+512+1024+2048+4096+8191+16382
  +32764+65528+131056+262112+524224+1048448+2096896+4193792+8387584+16775168)
  Recherche... 33550400



PARFAIT, last version:
Version Linux Version Dos/Windows parfait.zip, C source with compiled version for Linux, Dos / Windows