435600

Appears in sequences

• Order of (usually) simple Chevalley group D_2(q), q = prime power.at n=7A003848
• Sigma(n) / d(n) is a perfect square associated with A049226.at n=33A049227
• Numbers k such that the numerator of Sum_{d|k} 1/d > 3*k.at n=22A069096
• Square associated with twin primes (p,p+2): p(p+2) + 1. Square of the average of twin primes.at n=29A075369
• Squares which are the product of a non-palindrome and its reversal, where leading zeros are not allowed.at n=3A076750
• Even squares which can be expressed as the product of a number and its reversal in at least two different ways.at n=1A083406
• Squares which can be expressed as the product of a number and its reversal in at least two different ways.at n=1A083408
• a(1)=1; at n>=2, a(n) = least square > a(n-1) such that sum a(1)+...+a(n) is a prime number.at n=31A139033
• One quarter the number of n X 4 1..4 arrays with no two neighbors of any element equal to each other.at n=8A183356
• One quarter the number of nX9 1..4 arrays with no two neighbors of any element equal to each other.at n=3A183361
• Non-palindromes whose squares are in A066531.at n=26A206642
• Number of 4 X n 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 0 1 1 vertically.at n=9A208014
• Number of 6 X n 0..1 arrays avoiding 0 0 0 and 1 1 1 horizontally and 0 0 1 and 0 1 1 vertically.at n=7A208071
• Number of n X 6 0..1 arrays avoiding 0 0 1 and 0 1 1 horizontally and 0 0 1 and 1 0 1 vertically.at n=8A208140
• Areas of primitive Heronian triangles K which are perfect squares.at n=15A248108
• a(n) = Catalan(n)^2*(4n + 1).at n=6A267980
• Composite numbers k such that sum of proper divisors of k divides 2^k-1.at n=22A278315
• Numbers n such that phi(n) * tau(n) divides n^2, but neither tau(n) nor phi(n) divides n.at n=24A287800
• Squares which can be expressed as the product of a number and its reversal in exactly two ways.at n=1A325150
• Numbers where records occur for the product of exponential divisors function (A157488).at n=33A332622