Number of $7$-digit telephone numbers with non-decreasing digits? strictly increasing digits?
25563
Count number of increasing functions, nondecreasing functions $f: \{1, 2, 3, \ldots, n\} \to \{1, 2, 3, \ldots, m\}$, with $m \geq n$.
131704
A dollar amount $\${-}67.9{-}$ is divisible by 72. What is this number?
52416
The final number after $999$ operations.
80327
Last digits, numbers
23744
Is it possible to increment numbers using regex substitution?
147632
Regex phone number to accept +
100613
Prove that if an average of a thousand numbers is less than 7, then at least one of the numbers being averaged is less than 7
11447
How many $4$ digit even numbers have all $4$ digits distinct?
143620
How many $n$-digit decimal sequences (using the digits $0 = 9$) are there in which the digits $1$, $2$ and $3$ all appear?
116540
Positive integers less than 1000 without repeated digits
79377
Find the last $2$ digits of $7^{7^{7^{10217}}}$
90032
Problem on Sum of Digits of a Number
52518
Infinite sequence of digits without consecutive repeating subsequenes
49987
Gets last digit of a number
142135
A number with 6 distinct digits which get multiplied by 5 if we move the last digit to front
65802
The number of 5-digit numbers such that their sum of digits is even is?
55053
smallest number for given sum of digits