There appears to be a bug that has surfaced since I'm using two processors on a server board.  Here is the output of sensors:

# sensors
coretemp-isa-0000
Adapter: ISA adapter
Core 0: +45.0°C (high = +78.0°C, crit = +100.0°C)
Core 1: +46.0°C (high = +78.0°C, crit = +100.0°C)
Core 2: +42.0°C (high = +78.0°C, crit = +100.0°C)
Core 3: +45.0°C (high = +78.0°C, crit = +100.0°C)

coretemp-isa-0001
Adapter: ISA adapter
Core 0: +39.0°C (high = +78.0°C, crit = +100.0°C)
Core 1: +39.0°C (high = +78.0°C, crit = +100.0°C)
Core 2: +38.0°C (high = +78.0°C, crit = +100.0°C)
Core 3: +39.0°C (high = +78.0°C, crit = +100.0°C)

However, only cores 0-3 on isa-0001 show up; isa-0002 is unpopulated.  I'm guessing this is because they have the same name?