19283

Appears in sequences

• Numbers k such that 45*2^k - 1 is prime.at n=51A002242
• Numerators of continued fraction convergents to sqrt(781).at n=8A042506
• A triangle sequence derived from setting an Euler numbers A122045 generalization equal to the MacMahon numbers A060187 to get a generating function expansion: p(x,t) = (exp(t)* (1 - exp(x))* x)/(exp(2 t + t x) + exp(t)* x - exp(t*x)* x).at n=39A178234
• Numbers n for which the numbers 6n+1, 3n+2, 6n+7 are all odd composite squarefree numbers, but none are semiprimes.at n=30A263510
• Number of nX2 0..n*2-1 arrays with upper left zero and lower right n*2-1 and each element differing from its horizontal, vertical and antidiagonal neighbors by a power of two.at n=7A265595
• T(n,k)=Number of nXk 0..n*k-1 arrays with upper left zero and lower right n*k-1 and each element differing from its horizontal, vertical and antidiagonal neighbors by a power of two.at n=37A265601
• T(n,k)=Number of nXk 0..n*k-1 arrays with upper left zero and lower right n*k-1 and each element differing from its horizontal, vertical and antidiagonal neighbors by a power of two.at n=43A265601
• Number of lone-child-avoiding locally disjoint rooted trees whose leaves are integer partitions whose multiset union is an integer partition of n.at n=9A331678