Find all strings of length 4 over the alphabet {0, 1, 2} with the property that there are no 10, 21, or 20 substrings.
25590
Find a recurrence relation for the number of ternary strings of length n that do not contain two consecutive 0s or two consecutive 1s.
115795
Substr(). Add characters for each n digits
56233
Is the set of all strings with countably infinite length bijective to $[0,1]$?
118783
Counting the number of strings that start and end with the same letter, are palindromes, or contain vowels only
8645
A formula for bit strings with no $k$ consecutive $1$'s using generating functions
73575
Number of pairs of strings satisfying the given condition
16497
Checking string length with strlen
76725
Finding all length-n words on an alphabet that have a specified number of each letter
40970
All the ternary n-words with an even sum of digits and a zero.
21337
Determining whether a string has a substring (word)
32039
What are the trailing number of the zeroes in the given integer
52518
Infinite sequence of digits without consecutive repeating subsequenes
128627
Algorithm to find next greater permutation of a given string
633
Number of bit strings
6125
Combinatorial expression for all ternary strings that don't have consecutive 1's and 2's
34334
Combinatorics Problem with symbols and spaces
478
How to determine if string contains specific substring within the first X characters