81809

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 44.at n=12A031722
• a(n) is the smallest number m such that phi(m)+sigma(m)=n*pi(m).at n=18A145747
• a(n) = 169*n^2 + 13.at n=22A158548
• Numbers n such that sigma(n)/phi(n) = 16/9.at n=4A164647
• Numbers such that the sum of the squares of the largest and the smallest prime divisor equals the sum of the squares of the other distinct prime divisors.at n=2A199857
• Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 3, 4, 7 or 8 king-move adjacent elements, with upper left element zero.at n=6A317113
• Number of nX7 0..1 arrays with every element unequal to 0, 1, 2, 3, 4, 7 or 8 king-move adjacent elements, with upper left element zero.at n=2A317117
• T(n,k)=Number of nXk 0..1 arrays with every element unequal to 0, 1, 2, 3, 4, 7 or 8 king-move adjacent elements, with upper left element zero.at n=38A317118
• T(n,k)=Number of nXk 0..1 arrays with every element unequal to 0, 1, 2, 3, 4, 7 or 8 king-move adjacent elements, with upper left element zero.at n=42A317118
• Expansion of x^2*(10-5*x+x^2)/((1-x)^4*(1-x^2)).at n=27A331429
• Numbers k that divide the k-th little Schroeder number.at n=29A372903