532224

Appears in sequences

• Number of divisors of n!.at n=26A027423
• a(n) = Sum_{d|4} phi(d)*n^(4/d).at n=27A054603
• Numbers k such that k * (digit complement of k) is a square.at n=13A069000
• Denominators of n-th approximation of factorial (also called harmonic) expansion of Pi.at n=10A131446
• Number of nX2 array permutations with each element moved no more than a city block distance of two.at n=5A188953
• Number of nX6 array permutations with each element moved no more than a city block distance of two.at n=1A188957
• T(n,k)=Number of nXk array permutations with each element moved no more than a city block distance of two.at n=22A188958
• T(n,k)=Number of nXk array permutations with each element moved no more than a city block distance of two.at n=26A188958
• Triangle T(n,k), n>=0, 0<=k<=C(n,2), read by rows: T(n,k) = number of k-length saturated chains in the poset of Dyck paths of semilength n ordered by inclusion.at n=37A193536
• 3-quantum transitions in systems of N>=3 spin 1/2 particles, in columns by combination indices.at n=27A213345
• Numbers n such that there exists an m so that squarefree kernel of n = squarefree kernel of m, and n is the sum of the proper divisors of m (m may equal n).at n=35A252234
• Number of maximum irredundant sets in the n-web graph.at n=18A308350
• a(n) is the smallest number m with exactly n divisors that are Zuckerman numbers, or -1 if there is no such m.at n=31A335038
• Integers whose number of divisors that are Zuckerman numbers sets a new record.at n=22A340638
• T(m,n) is the number of linear extensions of n fork-join DAGs of width m, read by downward antidiagonals.at n=25A357297
• The number of linear extensions of n fork-join DAGs of width 4.at n=2A362565