19443

Appears in sequences

• Numbers whose concatenation of prime factors (with multiplicity) is a square.at n=37A038693
• a(n)*n = A112904(n).at n=3A112905
• E.g.f.: A(x) = (exp(x)/(3 - 2*exp(x)))^(1/3).at n=6A136727
• Eight white kings and one red king on a 3 X 3 chessboard. G.f.: (1 + x)/(1 - 2*x - 9*x^2 - 2*x^3).at n=7A179604
• Sum of the sizes of the kernels of all integer partitions of n.at n=22A218904
• Expansion of Sum_{i>=1} mu(i)^2*x^i/(1 - x^i) * Product_{j>=i} 1/(1 - mu(j)^2*x^j), where mu() is the Moebius function (A008683).at n=33A284829
• a(n) is the smallest integer k such that the Diophantine equation x^3 + y^3 + z^3 = k^3 has exactly n positive primitive integer solutions.at n=10A391773