828100

Appears in sequences

• (Terms in A014762)/4.at n=27A051514
• a(n) = (n+1)^2*(n+2)^2*(n+3)^2*(n+4)/144.at n=12A108647
• a(n) = ((n-1)^2*n^2*(n+1)^2)/6 - 2*Sum_{l=2..n}Sum_{k=2..n}(n-k+1)*(n-l+1)*(k-1)*(l-1).at n=14A169801
• Numbers with prime factorization p^2*q^2*r^2*s^2 where p, q, r, and s are distinct primes.at n=13A190377
• Composite numbers whose number of proper divisors has a number of proper divisors which has a prime number of proper divisors.at n=24A223457
• Squares t^2 = (p+q+r+s)/4 which are the arithmetic mean of four consecutive primes such that p < t^2 < q < r < s.at n=5A234318
• Numbers k with the property that it is possible to write the base 2 expansion of k as concat(a_2,b_2), with a_2>0 and b_2>0 such that, converting a_2 and b_2 to base 10 as a and b, we have (a+b)^2 = k.at n=30A258844
• Number of minimum dominating sets in the n X n rook complement graph.at n=13A292074
• The squares of squarefree numbers (A062503), ordered lexicographically according to their prime factors. a(n) = Product_{k in I} prime(k+1)^2, where I are the indices of nonzero binary digits in n = Sum_{k in I} 2^k.at n=45A334110
• Triangle read by rows. T(n, k) = (n - k + 1) * binomial(n + k + 1, 2*k)^2 / (n + k + 1).at n=51A370233