321048

Appears in sequences

• a(n) = (n+1)*(n+2)^3*(n+3)^4*(n+4)^3*(n+5)*(2n+5)*(2n+7)/7257600.at n=4A109124
• Triangle of coefficients c(n,i), 1<=i<=n, such that for each n>=2, c(n,i) are setwise coprime; and for all primes p>2n-1, the sum of (-1)^i*c(n,i)*binomial(i*p,p) is divisible by p^(2n-1).at n=39A268512
• Numbers such that the sum of divisors is twice the sum of the exponential divisors.at n=10A274205
• Numbers m such that there are at least two smaller numbers k < m with the same harmonic mean of divisors as m.at n=0A348697
• The number of interior points that are intersections of exactly two chords for a 2n-gon where all its vertices are joined by lines (cf. A006561).at n=27A352144