54405

Appears in sequences

• Expansion of Product_{m>=1} 1/(1 + m*q^m)^5.at n=16A022697
• Numbers k that divide the (left) concatenation of all numbers <= k written in base 19 (most significant digit on left).at n=52A029488
• Number of diagonal dissections of an n-gon into 3 regions.at n=26A033275
• Numbers n such that n and n+1 are differences between 2 positive cubes in at least one way.at n=28A038594
• Octagonal numbers which are the sums of exactly two positive octagonal numbers.at n=25A136346
• a(n) = (4*n^3 + n^2 - 3*n)/2.at n=30A172073
• Triangle T(n,k) read by rows of the smallest n-gonal number greater than 1 that is also k-gonal, or 0 if none exists, for 3 <= k <= n.at n=33A189216
• Numbers which are both decagonal and octagonal.at n=1A203624
• a(n) = (n-1)*(n-2)*(n+3)*(n+2)/12.at n=28A299120
• Numbers that have exactly 7 representations as a k-gonal number, P(n,k) = n*((k-2)*n - (k-4))/2, k and n >= 3.at n=10A321157