11531520

Appears in sequences

• a(n) = (n/(n+1)) * lcm(1,2,...,n+1).at n=15A025558
• Group even numbers into (2), (4,6), (8,10,12), (14,16,18,20), ...; a(n) = product of n-th group.at n=4A062029
• a(n) = n*lcm{1,2,...,n}.at n=15A081528
• Numerator of the harmonic mean of the first n positive integers.at n=15A102928
• Denominators of first difference of squares of harmonic numbers A001008/A002805.at n=15A103933
• Denominator of x(n) = Sum_{k=1..n} ((odd part of k)/(k^2)).at n=15A111930
• First differences of A003418(n) = lcm(1..n).at n=16A119944
• The slowest growing sequence that satisfies: a(1) = 1, a(n) is a multiple of n and a(n-1), and a(n) > a(n-1).at n=14A191836
• 5-quantum transitions in systems of N>=5 spin 1/2 particles, in columns by combination indices.at n=31A213347
• 5-quantum transitions in systems of N>=5 spin 1/2 particles, in columns by combination indices.at n=32A213347
• Denominators of constants A(a) related to the asymptotic LCM of arithmetic progressions a*n+b (a and b coprime).at n=16A249226
• Positions of records in A220400.at n=39A297160
• Noninfinitary highly composite numbers: where the number of noninfinitary divisors (A348341) increases to a record.at n=37A348342
• Triangle read by rows. T(n, k) = ((2*n)! * k!) / (n + k)!.at n=38A357013
• Numbers with a record high excess of even over odd divisors; so indices of record lows in A048272.at n=43A369151
• Numbers k where records occur for d(k)/d(k+1), where d(k) is the number of divisors of k (A000005).at n=39A372092