20125

Appears in sequences

• Number of n-bead necklace structures using exactly three different colored beads.at n=12A056296
• Number of primitive (period n) n-bead necklace structures using exactly three different colored beads.at n=12A056304
• a(n) = n * [1 + sum(k=1 to n) prime(k)].at n=23A083725
• Number of partitions of n such that the set of even parts has only one element.at n=47A090867
• Number of (w,x,y,z) with all terms in {1,...,n} and w+x<=y+z.at n=14A212560
• Smallest odd number greater than any previous term such that it divides the concatenation of all the previous terms and itself; begin with 1.at n=12A228806
• a(n) = n*(n + 1)*(11*n^2 + 11*n - 10)/24.at n=14A264854
• Numbers k such that 6^k + 17 is prime.at n=19A309527
• Number of n-bead necklace structures which are not self-equivalent under a nonzero rotation using exactly three different colored beads.at n=12A328740
• The number of vertices on a 2 by 1 ellipse formed by the straight line segments mutually connecting all points formed by dividing the ellipse into 2n equal angle sectors from its origin.at n=13A341762
• Number of regions formed when n equally spaced points are placed around a circle and all pairs of points are joined by an interior arc whose radius equals the circle's radius.at n=25A371253