These are average load values ββfor the last 1, 5, and 15 minutes; they are not related to your cores.
On the man page:
uptime gives a one line display of the following information. The current time, how long the system has been running, how many users are currently logged on, and the system load averages for the past 1, 5, and 15 minutes.
For more information, see the personβs working hours .
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