409500

Appears in sequences

• a(n) = number of (s(0), s(1), ..., s(n)) such that every s(i) is a nonnegative integer, s(0) = 0, s(1) = 1, s(n) = 3, |s(i) - s(i-1)| <= 1 for i >= 2. Also a(n) = T(n,n-3), where T is the array defined in A026105.at n=12A026109
• Infinitary harmonic numbers: harmonic mean of infinitary divisors is an integer.at n=27A063947
• a(n) = binomial(n+2,3)*5^3.at n=25A141480
• Smallest k such that the partial sums of the divisors of k (taken in increasing order) contain exactly n primes.at n=32A187822
• Numbers with prime factorization pqr^2s^2t^3.at n=27A190386
• Number of (w,x,y,z) with all terms in {1,...,n} and w>=average{x,y,z}.at n=30A212089
• Bi-unitary harmonic numbers.at n=37A286325
• a(n) = n * A276086(n).at n=52A324580
• Least common multiple of n and A276086(n).at n=52A328584
• Tri-unitary harmonic numbers: numbers k such that the harmonic mean of the tri-unitary divisors of k is an integer.at n=29A335387
• Numbers k such that A065642(k) = A081761(k).at n=13A340306
• a(n) is the smallest integer that has exactly n divisors from A333369.at n=32A355771
• Positions of records in A355770.at n=22A355772
• Integers z such that there exist two integers 0<x<=y<=z such that psi(x) = psi(y) = psi(z) = x + y + z.at n=9A386933