What's the formula for the 365 day penny challenge?
2675
Proof $1+2+3+4+\cdots+n = \frac{n\times(n+1)}2$
35339
Calculation of Score when earning a specific tag badge
90381
Concecutive last zeroes in expansion of $100!$
36362
What's wrong with my solution for the birthday problem?
123196
How to subtract n days from current date in java?
60647
Consecutive days problem #97?
125214
Catalan numbers - number of ways to stack coins
84095
How can I model flips until N successes?
53732
Calculate Time Remaining
14306
What is the formula for $\frac{1}{1\cdot 2}+\frac{1}{2\cdot 3}+\frac{1}{3\cdot 4}+\cdots +\frac{1}{n(n+1)}$
154225
How many positive numbers need to be added together to ensure that the sum is infinite?
51299
How many digits is $99^{99}$ without a calculator?
117275
What is the best way to determine the number of days in a month with JavaScript?
40648
How to calculate number of days between two given dates?
12926
number of ways to make $2.00
54794
British Olympiad; Combinatorics Recursion
64985
Get the numbers from (0-30) by using the number $2$ four times