28127

Appears in sequences

• Numbers k such that k and k^2 use only the digits 1, 2, 7, 8 and 9.at n=14A137018
• Sum of the numbers already killed in the first jump of a Sieve of Eratosthenes table.at n=35A179628
• Number of 2 X 2 matrices having all terms in {1,...,n} and determinant >= 2n.at n=16A211062
• Number of n X 3 nonnegative integer arrays with upper left 0 and lower right its king-move distance away minus 2 and every value within 2 of its king move distance from the upper left and every value increasing by 0 or 1 with every step right, diagonally se or down.at n=29A253218
• a(n) = Gamma(n+1, phi)*exp(phi) + Gamma(n+1, 1-phi)*exp(1-phi), where phi=(1+sqrt(5))/2.at n=7A277345
• Number of nX5 0..1 arrays with every element unequal to 0, 1, 3, 5 or 7 king-move adjacent elements, with upper left element zero.at n=9A304928