A faster way than tedious multiplying
19940
How to show that $A^3+B^3+C^3 - 3ABC = (A+B+C)(A+B\omega+C\omega^2)(A+B\omega^2+C\omega)$ indirectly?
59368
Convenient string manipulation
15951
Most efficient implementation of a large number class
125115
Simplifying Large Bases with large Exponents
108535
Incremental averageing
142634
How to add or subtract very large numbers without bigint in C#?
86825
Split Multiplication of integers
43864
Splitting very big numbers over several lines
9118
Polynomial division: an obvious trick? [reducing mod $\textit{simpler}$ multiples]
145256
Expanding out multiplied terms
57225
How to make my iterated function calculate more quickly?
45498
Building a hard to factor number without knowing its factorization
29095
Concise way to compare against multiple values
7837
What is the best way to add two numbers without using the + operator?
149895
A more convenient Fourier series
50866
How to calculate simple moving average faster in C#?
154129
Alternatives to "computationally expensive"?