27056

Appears in sequences

• Numbers k such that k!! - 1 is prime.at n=20A007749
• (prime(n)*(prime(n+1)-1) + (prime(n)-1)*prime(n+1)) / 2.at n=36A099909
• Triangular array read by rows: for n, k >= 1, a(n+1, 1) = 2*a(n, n); a(n+1, k+1) = a(n, k)+a(n+1, k).at n=32A129340
• Numbers that have 10 terms in their Zeckendorf representation.at n=27A179250
• Number of nX3 0..5 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.at n=3A203333
• Number of nX4 0..5 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.at n=2A203334
• T(n,k)=Number of nXk 0..5 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.at n=17A203338
• T(n,k)=Number of nXk 0..5 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.at n=18A203338
• Number of (n+1) X 2 0..1 arrays with column and row pair sums b(i,j)=a(i,j)+a(i,j-1) and c(i,j)=a(i,j)+a(i-1,j) nondecreasing in column and row directions, respectively.at n=16A204644
• Number of partitions p of n such that (number of parts of p) - min(p) is a part of p.at n=48A238547
• Numbers which are representable as a sum of nineteen but no fewer consecutive nonnegative integers.at n=31A270303
• a(n) is the index of the first occurrence of n in A166006.at n=29A278737
• Number of set partitions of [n] such that all absolute differences between least elements of consecutive blocks and between consecutive elements within the blocks are not larger than three.at n=11A287582