The coefficient in this is 1. The 1 is implied, since the product of 1 and any number gives that same number.
So you could write 1p or 1*p, depending on your nomenclature, but this is not normally done. We just write p.
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In the expression 5x + 3, the coefficient is 5.
k
The number is called the coefficient of the variable
7 is the coefficient of the variable d
In front of a variable in an algebraic expression.