18368

Appears in sequences

• Intermediate edge b of smallest (measured by the longest edge) primitive Euler bricks (a, b, c, sqrt(a^2 + b^2), sqrt(b^2 + c^2), sqrt(a^2 + c^2) are integers).at n=30A031174
• Minimal elements of pairs of "Super Unitary Amicable Numbers", sorted by their minimal elements.at n=40A045613
• Triangle of Delannoy paths counted by number of diagonal steps not preceded by an east step.at n=29A110446
• Triangle read by rows: T(n,k) is the number of paths in the right half-plane from (0,0) to (n,0), consisting of steps U=(1,1), D=(1,-1), h=(1,0) and H=(2,0), having k h=(1,0) steps (0<=k<=n).at n=71A132884
• 8 times octagonal numbers: 8*n*(3*n-2).at n=28A153808
• a(n) = 2*n*(9*n-1).at n=31A178574
• Number of ways to place 2 nonattacking kings on an n X n cylindrical chessboard.at n=13A194650
• Sum of odd divisors of !n.at n=8A195210
• Number of n X 4 0..1 arrays with row sums unimodal and column sums inverted unimodal.at n=3A223779
• T(n,k) = Number of n X k 0..1 arrays with row sums unimodal and column sums inverted unimodal.at n=24A223782
• a(n) is a refactorable number and the sum of all refactorable numbers <= a(n) is also a refactorable number.at n=37A235177
• Number of words of length n over the alphabet {0,...,n-1} that avoid the pattern 123.at n=6A239295
• Numbers k such that A022567(k) is divisible by k.at n=15A304048
• Numbers k that divide the k-th Franel number.at n=22A372940
• Consecutive states of the linear congruential pseudo-random number generator (625*s + 6571) mod 31104 when started at s=1.at n=13A385279