If sentencing is a mathematical equation, then Wayzata businessman Tom Petters should only spend four years in prison.
That's the argument Petters' defense attorneys made in a brief filed Thursday in which they labeled as "absurd" the government's request for a 335-year sentence for investment fraud committed by Petters.
The government still wants Petters put away for good when a judge imposes a sentence next week.
Defense attorneys Paul Engh and Jon Hopeman based their sentencing calculation on the 150-year sentence handed to New York investment adviser Bernard Madoff, whose $65 billion Ponzi scheme dwarfed the $3.65 billion fraud headed by Petters.
Petters' defense attorneys said Madoff's sentence broke down to 2 1/3 years for each $1 billion in losses.
Using that ratio in the Petters case and placing actual losses at $1.8 billion as opposed to "paper" losses of more than $3 billion, Engh and Hopeman calculated that Petters deserved a sentence of just over four years.
Petters, convicted on 20 counts of fraud, money laundering and conspiracy in December, is scheduled to be sentenced by U.S. District Judge Richard Kyle on Thursday. He's been in custody and confined since he was arrested in October 2008.
Prosecutors filed their request for a lengthy prison sentence in early March and asked Kyle to impose it because of the breadth of Petters' Ponzi scheme and to send a message to future criminals.