56745

Appears in sequences

• a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (Lucas numbers), t = (composite numbers).at n=26A024471
• Numbers n such that n-1, n and n+1 can be expressed as a sum of 2 squares in at least 2 ways.at n=7A091459
• Number of (undirected) paths in the n-helm graph.at n=14A292001
• Numbers k such that 4*k + 1 is a perfect cube, sorted by absolute values.at n=30A305290
• Triangular array read by rows: row n shows the coefficients of this polynomial of degree n: p(x,n) = ((x+r)^n - (x+s)^n)/(r - s), where r = 3 and s = 2.at n=37A327316
• a(n) = n*(3^(n-1) - 2^(n-1)).at n=9A344215