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Mar
6
answered Does anyone know a function that can describe a harmonic series?
Dec
3
answered Solve congruent equation with mod 125
Aug
31
comment Want to classify project euler problem 31
Hint: I learned a lot about generating functions by tackling questions such as this... Let polynomial multiplication do the counting for you!
Apr
9
comment Pattern to last three digits of power of $3$?
Using Mathematica, I would recommend Mod[3^Range[27],1000]
Nov
5
awarded  Teacher
Nov
5
answered Highest power of a prime $p$ dividing $N!$