153760

Appears in sequences

• a(n) = n^2*(n^2 - 1)/6.at n=31A008911
• Coefficients of the v=1 member of a family of certain orthogonal polynomials.at n=32A130182
• a(n) = (prime(n)^4 - prime(n)^2)/6.at n=10A138421
• Number of arrangements of n indistinguishable balls in n boxes with the maximum number of balls in any box equal to n-3.at n=27A180293
• Second pentagonal numbers that are interprime.at n=38A205881
• Numbers whose sum of proper square divisors is a palindrome in base 10 having at least two digits.at n=15A232892
• Numbers whose sum of square divisors is a palindrome in base 10 having at least two digits.at n=6A232893
• Numbers n such that there exists an m so that squarefree kernel of n = squarefree kernel of m, and n is the sum of the proper divisors of m (m may equal n).at n=28A252234
• a(n) = Sum_{k=1..n-1} lcm(lcm(n, k), lcm(n, n-k)).at n=30A338798