575025

Appears in sequences

• a(n) = (2*n+1)*(3*n+1)*(4*n+1)*(5*n+1).at n=8A033592
• a(n) = ((8*n+9)(!^8))/9, related to A045755 ((8*n+1)(!^8) octo- or 8-factorials).at n=4A053114
• a(n) = n*(n+1)*(n^2-2*n+2)/2.at n=33A101375
• Odd numbers k such that k and phi(k) have the same number of divisors.at n=8A116518
• a(n) is the denominator of polygamma(2n+1, 1) / Pi^(2n+2).at n=39A255007