How many the binary sequences of length n such there are no two zeros next to each other?
109920
Ordered binary sequences of length n with no two consecutive 0's without using recursion
32039
What are the trailing number of the zeroes in the given integer
54941
number of trailing zeros
9411
Number of permutations of $n$ elements where no number $i$ is in position $i$
40970
All the ternary n-words with an even sum of digits and a zero.
27840
What about $[n,k,7]$ binary perfect code? (Exercise from the book Fundamentals of Error Correcting Codes)
157767
Finding islands of zeros in a sequence
80744
What is the number of strings at size $n$ that is constructed from ${a,b,c,d}$ and there is an even num of $a$
95143
What follows next in the sequence "unary, binary, ternary..."?
74829
Number of non decreasing sequences of length $M$
37958
Derive a formula to find the number of trailing zeroes in $n!$
58508
Number of ways to pair off $2n$ points such that no chords intersect
102136
How many subsets contain no consecutive elements?
102968
How to find out if a binary number is zero
39420
binary numbers?
123407
Combinatorics - binary - very interesting question
151375
There are $3$ Zero-Sum Numbers!