54027

Appears in sequences

• a(n) = n*(14*n^2 - 21*n + 13)/6.at n=29A071229
• a(n) = n^3 - 3*(n+3)^2.at n=39A153260
• a(n) = k is a number such that A007535(k), the smallest pseudoprime to base k ( > k), is the n-th Carmichael number.at n=14A293563
• Triangle T(n,k) read by rows: T(n,k) = number of ways of seating n people around a table for the second time so that k pairs are maintained. Reflected sequences are counted as one.at n=47A326397
• Number of (curved) edges 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=26A371255