Hi Matarse and Acetronics. That's a fact that there's nothing pure RANDOM in the world... even everything is made by machine who operate by logical operation.

RANDOM is close to be a real RANDOM but, in the Matarse's case, we have to limit the range by ANDings, this is maybe why some results comes up more often than others

255 & 63 = 63
127 & 63 =63
4095 & 63 =63

etc...

if you want to avoid some possible combination.. why not store one serie in eeprom, internal one or external, and see if already comes, in case yes, redo random....

regards...

P.S.: PLEASE, since not everybody 'round here speak french, for the respect of the forum rules and peers, post in english. Some other can really help you. But if they don't understand... what is the chance to get help from them! Other than english can/must be post in private... i think.