245700

Appears in sequences

• a(n) = n*(n + 1)*(n + 2)*(n + 3)/2.at n=25A033486
• Triangle T(n,k) of number of minimal 5-covers of a labeled n-set that cover k points of that set uniquely (k=5,..,n).at n=13A057966
• Infinitary harmonic numbers: harmonic mean of infinitary divisors is an integer.at n=25A063947
• Sum of three solutions of the Diophantine equation x^2 - y^2 = z^3.at n=30A085409
• a(n) = C(1+n,1) * C(2+n,1) * C(4+n,2).at n=24A112415
• Smallest number having exactly n triangular divisors.at n=21A130317
• Triangle of Generalized Runyon numbers R_{n,k}^(3) read by rows.at n=40A173020
• Triangle T(n,m) read by rows: The number of m-Schroeder paths of order n with 2 diagonal steps.at n=13A173622
• Numbers with prime factorization pqr^2s^2t^3.at n=7A190386
• Bi-unitary harmonic numbers.at n=31A286325
• a(n) = Product_{d|n, d<n} A019565(d)^[2 == d mod 3].at n=69A319992
• Tri-unitary harmonic numbers: numbers k such that the harmonic mean of the tri-unitary divisors of k is an integer.at n=26A335387
• a(n) is the smallest integer that has exactly n divisors from A333369.at n=30A355771
• Positions of records in A355770.at n=20A355772
• Infinitary arithmetic numbers k whose mean infinitary divisor is an infinitary divisor of k.at n=13A361387
• Bi-unitary arithmetic numbers k whose mean bi-unitary divisor is a bi-unitary divisor of k.at n=18A361787
• Number of vertices in a regular 2n-gon when all vertices are connect by straight lines except for the n lines joining diametrically opposite vertices.at n=25A368814
• 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=4A386933