256036

Appears in sequences

• Squares of even square pyramidal numbers.at n=4A014798
• Smallest nontrivial extension of n-th square which is a square not ending 00.at n=15A030688
• Number of ways to place a non-attacking white and black rook on n X n chessboard.at n=22A035287
• T(n,k) = (floor(k*n/2) * ceiling(k*n/2))^2, triangular array read by rows, 1 <= k <= n.at n=40A089083
• Numbers k such that A094471(k) is prime.at n=39A096847
• Squares with an even number of digits, where the first half is a square and the second half is a nonzero square.at n=4A145848
• Squares which are concatenation of two positive squares with possible intervening zeros.at n=24A147608
• a(n+1) is next smallest square not divisible by 10 beginning with a(n), initial term is 2.at n=3A249893
• Primitive numbers whose abundance is positive and odd.at n=26A259231
• Squares that become prime when their rightmost digit is removed.at n=36A265211
• a(n) = ( n*(n + 1)*(2*n + 1)/6 )^2.at n=11A271535
• a(n) is the least k such that phi(k) + d(k) = A357916(n), where phi(k) = A000010(k) is Euler's totient function, and d(k) = A000005(k) is the number of divisors of k.at n=43A357917
• Numbers that have exactly one Zumkeller divisor but are not Zumkeller.at n=19A376877