52065

Appears in sequences

• Number of 2n X 2 0..4 arrays with values 0..4 introduced in row major order and each element unequal to exactly two horizontal and vertical neighbors.at n=3A198508
• T(n,k)=Number of 2nX2k 0..4 arrays with values 0..4 introduced in row major order and each element unequal to exactly two horizontal and vertical neighbors.at n=6A198511
• T(n,k)=Number of 2nX2k 0..4 arrays with values 0..4 introduced in row major order and each element unequal to exactly two horizontal and vertical neighbors.at n=9A198511
• E.g.f. satisfies: A(x) = Sum_{n>=0} n^n * x^n/n! * A(n*x).at n=5A218683
• Numbers k such that {k + 2, k + 4} and {k^2 + 2, k^2 + 4} are both twin prime pairs.at n=23A284014
• Triangle T(n,k) read by rows: coefficients of polynomials P_n(t) defined in Formula section.at n=25A321711
• Numbers m such that both m^2-1 and m^2 are refactorable numbers (A033950) and that m^2 has more divisors than m^2-1.at n=23A342970