2059318800

Appears in sequences

• a(n) = (1/C(2n,0) - 1/C(2n,1) + ... + d/C(2n,2n))*L, where d = (-1)^2n, L = LCM{C(2n,0), C(2n,1),..., C(2n,2n)}.at n=12A025535
• a(n) is the least common multiple of numbers in {1,2,3,...,n-1} which do not divide n.at n=25A067391
• Denominator of n*sum(k=1,(-1)^(k+1)/(n+k)).at n=12A082690
• Smallest number divisible by all numbers from 1 to 2*n-1, but not divisible by n, or 0 if impossible.at n=11A230478
• Denominator of n*Sum_{k=1..n} 1/(n+k).at n=12A296519
• a(n) is the period of the periodic k-sequence q_k=lcm(k+1,k+2,...,k+n)/(n*binomial(k+n,n)).at n=25A319404
• Smallest number whose divisors > 1 have a longest run of length n, and 0 if none exists.at n=11A328448
• Denominator of the sum of all elements of the n X n matrix M with M[i,j] = (-1)^(i+j)*i/j for i,j = 1..n.at n=24A334724
• Denominator of the sum of all elements of the n X n matrix M with M[i,j] = (-1)^(i+j)*i/j for i,j = 1..n.at n=25A334724