5664400

Appears in sequences

• Squares of even pentagonal numbers.at n=20A014770
• Squares which are palindromes in base 13.at n=15A029999
• a(n) = (2*n*(n+1))^2.at n=34A060300
• Base-13 representation of a(n) is the concatenation of the base-13 representations of 1, 2, ..., n, n-1, ..., 1.at n=4A260863
• a(n) = binomial(n+4, n)^2. Square of the fifth diagonal sequence of A007318 (Pascal). Fifth diagonal sequence of A008459.at n=13A288876
• a(n) is the number of subsets of {1..n} that contain 4 even and 4 odd numbers.at n=34A331575
• Exponential barely deficient numbers: exponential deficient numbers whose exponential abundancy is closer to 2 than that of any smaller exponential deficient number.at n=12A336253
• Numbers k such that k*A003557(A003961(k)) divides A353790(k), where A353790(n) = phi(A003973(n)) * A064989(A003973(n)).at n=41A353797