26335

Appears in sequences

• Number of monotone Boolean functions of n variables with 2 mincuts. Also number of Sperner systems with 2 blocks.at n=6A016269
• Pseudoprimes to base 11.at n=41A020139
• Strong pseudoprimes to base 81.at n=37A020307
• Strong pseudoprimes to base 99.at n=21A020325
• Odd triangular numbers with prime indices.at n=22A034954
• a(n) = n*(13*n^2 - 7)/6.at n=23A062025
• Half the number of n X 8 binary arrays with a path of adjacent 1's and a path of adjacent 0's from top row to bottom row.at n=1A069408
• Triangular number x such that x + reverse of x is a prime.at n=10A072387
• Third row of Pascal-(1,6,1) array A081581.at n=33A081591
• Triangular numbers which are one more than a product of distinct triangular numbers.at n=18A083517
• Triangular numbers such that the least common multiple of a pair of successive terms is triangular.at n=5A093800
• Nonprime numbers n such that phi(n) divides n^2 - 1, where phi(n) (A000010) is Euler's totient function.at n=18A098271
• Triangle T, read by rows, equal to the matrix inverse of the triangle defined by [T^-1](n,k) = (n-k)!*A008278(n+1,k+1), for n>=k>=0, where A008278 is a triangle of Stirling numbers of 2nd kind.at n=42A106340
• Triangle read by rows: matrix product of the Stirling numbers of the second kind with the binomial coefficients.at n=42A126351
• Numbers simultaneously triangular and centered triangular.at n=4A128862
• Triangular numbers congruent to 1 or 5 mod 6.at n=38A128880
• Triangular numbers that are the sum of three consecutive triangular numbers.at n=3A129803
• Numbers k such that k and k^2 use only the digits 2, 3, 5, 6 and 9.at n=15A137082
• Triangle read by rows: T(n,k) = number of forests of k labeled rooted trees of height at most 1, with n labels, where any root may contain >= 1 labels, n >= 0, 0 <= k <= n.at n=38A143395
• Triangle read by rows: 2-Stirling numbers of the second kind.at n=38A143494