10581480

Appears in sequences

• a(n) = LCM(1,2,...,n) / n.at n=21A002944
• Denominators of partial sums of reciprocals of lcm(1..n) = A003418(n).at n=18A064858
• a(n) = lcm(1..n) / ((n+1)(n+2)...(n+k)) where k is the largest number which gives an integral value.at n=20A069491
• Duplicate of A002944.at n=21A081529
• Given (1) f(h,j,a) = ( [ ((a/gcd(a,h)) / gcd(j+1,(a/gcd(a,h)))) * (h(j+1)) ] - [ ((a/gcd(a,h)) / gcd(j+1,(a/gcd(a,h)))) * (ja) ] ) / a then let (2) a(h) = d(h,j) = lcm( f(h,j,1) ... f(h,j,h) ).at n=10A091342
• Numbers that can be expressed as the difference of the squares of primes in exactly twenty-four distinct ways.at n=5A092020
• a(n) = lcm{1, 2, ..., n}/(n*(n-1)), n >= 2.at n=21A099946
• Denominator of the sum of all elements in the n X n Hilbert matrix M(i,j) = 1/(i+j-1), where i,j = 1..n.at n=10A117664
• Triangle T(n, k) = ((n-k)/6)*binomial(n-1, k-1)*binomial(2*n, 2*k) with T(n, 0) = T(n, n) = 1, read by rows.at n=59A174119
• Triangle T(n, k) = ((n-k)/6)*binomial(n-1, k-1)*binomial(2*n, 2*k) with T(n, 0) = T(n, n) = 1, read by rows.at n=61A174119
• Denominator of the product of n and the n-th harmonic alternating number, Sum_{k=1..n} (-1)^(k+1)/k.at n=21A334721