6760000

Appears in sequences

• Squares of tetrahedral numbers: a(n) = binomial(n+3,n)^2.at n=23A001249
• Squares of even tetrahedral numbers (A015220).at n=18A014796
• Numbers n such that n and its 10's complement are both squares, i.e., n and 10^k - n (where k is the number of digits in n) are squares.at n=25A068810
• Numbers n such that n multiplied by its reverse yields a fourth power.at n=25A131760
• Alternatively squares and cubes with prime differences.at n=46A186882
• Number of 7Xn 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 0 1 1 vertically.at n=7A208122
• 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=14A234318
• Squares where larger digits have smaller multiplicity.at n=38A378498