in mplab help under pickit3 or icd3 there is a schematic showing the resistor is somewhere between 4k7 and 10k.
The resistor pulls up the Vpp (/MCLR) to Vdd when noting is connected.. during programming the pickit3 or icd3 will driver Vpp low at some stage to put the part in to reset and eventually drive to Vpp programming voltage.
regards
Joe
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