[[Harry Nelson|Nelson]] & [[David Slowinski|Slowinski]] originally
discovered the number and announced it was prime on September 25,
1982.
Liar.
See http://en.wikipedia.org/wiki/Talk:Mersenne_prime#A_Recently_Disproven_Mersenne_Prime
In any case one wonders why he refers to prime_s_. Even if it were true
the only earth-shattering consequence would be that Slowinski would have
had to (if he was still using it) fix a bug in his computer program.