1690000

Appears in sequences

• a(n) = (2*n*(n+1))^2.at n=25A060300
• Numbers of the form (10^i)*(13^j), with i, j >= 0.at n=23A108761
• Number of 7 X n binary arrays without the pattern 0 1 diagonally or antidiagonally.at n=9A188829
• Numbers with prime factorization p^2*q^4*r^4 where p, q, and r are distinct primes.at n=16A190471
• Squares, without multiplicity, that are the concatenation of two integers (without leading zeros) the product of which is also a square.at n=35A258060
• Number of (n+2)X(n+2) 0..1 arrays with no 3x3 subblock diagonal sum less than the antidiagonal sum or central row sum less than the central column sum.at n=22A258886
• a(n) = sigma_2(n)^2.at n=29A356533
• a(n) = sigma_2(n)^2.at n=34A356533
• a(n) = Product_{k=0..n} (4^k + 4^(n-k)).at n=3A369675