25484

Appears in sequences

• Every prefix prime in base 9 (written in base 9).at n=42A024769
• Number of rooted compound windmills with n nodes where any 2 submills extending from the same node are different.at n=15A032160
• Number of planar triangular n X n X n nonnegative integer grids symmetric under 120 degree rotation with every similarly oriented 5 X 5 X 5 subtriangle summing to 12.at n=8A154085
• Number of (w,x,y) with all terms in {0,...,n} and w != max(|w-x|,|x-y|,|y-w|).at n=29A213498
• Numbers that are equal to the arithmetic derivative of the sum of their aliquot parts.at n=4A248816
• a(n) is the total number of down steps between the (n-1)-th and n-th up steps in all 3-Dyck paths of length 4*n. A 3-Dyck path is a nonnegative lattice path with steps (1, 3), (1, -1) that starts and ends at y = 0.at n=6A334978
• a(n) = Sum_{k=0..n} binomial(n,k) * binomial(8*k,k) / (7*k + 1).at n=5A346650
• Symmetric triangle read by rows refining A109113.at n=47A382880
• Symmetric triangle read by rows refining A109113.at n=50A382880