21275

Appears in sequences

• The consecutive squares of numbers multiplied by their next consecutive integer.at n=20A193608
• Floor(6^n/(1+1/(2*cos(5*Pi/11)))^n).at n=35A240840
• Number of decagons that can be formed with perimeter n.at n=42A288256
• Odd numbers k that can be factored to such a pair of coprime factors x and y that A347381(k) < min(A347381(x), A347381(y)).at n=14A347390
• Positions of 3's in A347381.at n=24A347393
• Odd numbers k such that k/(1+A347381(k)) obtains record values, where A347381 gives the distance from n to the nearest common ancestor of n and sigma(n) in the Doudna-tree.at n=23A386423