462400

Appears in sequences

• Squares of tetrahedral numbers: a(n) = binomial(n+3,n)^2.at n=14A001249
• Squares of even tetrahedral numbers (A015220).at n=11A014796
• Squares whose digits are all even.at n=20A030098
• Squares arising in A063076.at n=20A063082
• k^2 is a term if k^2 + (k-1)^2 and k^2 + (k+1)^2 are primes.at n=22A075577
• Even-digit perfect powers.at n=23A075787
• Initial values for f(x)=phi(sigma(x)) such that iteration of f ends in a cycle of length 18.at n=4A096890
• Number of n X 8 binary arrays without the pattern 0 1 diagonally or antidiagonally.at n=11A188823
• Numbers with prime factorization p^2*q^2*r^6 where p, q, and r are distinct primes.at n=14A190469
• Number of nX6 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 0 and 1 1 1 vertically.at n=11A209222
• Number of 2 X 2 matrices having all terms in {1,...,n} and odd determinant.at n=32A211065
• Squares that remain squares if you decrease them by 4 times a repunit with the same number of digits.at n=2A273231
• a(n) is the number of subsets of {1..n} that contain 3 even and 3 odd numbers.at n=34A331574
• Numbers k such that (65*k)^2 can be represented in exactly 4 ways as the sum of a positive square and a positive fourth power.at n=12A346594
• a(n) is the number of 2 X 2 matrices over the integers mod n that are invertible mod n for every permutation of their elements.at n=31A367926