90168

Appears in sequences

• Partial sums of A051947.at n=11A050483
• Numbers n such that n*phi(n-1) is a perfect square.at n=32A069069
• a(n) = 18n^3 + 6n^2.at n=17A087887
• Number of permutations of 1..n with both permutation and its inverse having exactly 2 maxima.at n=13A180392
• Primitive integer length of the side of an origin-centered square that contains inside its boundary a point with integer coordinates that is an integer distance from three of the four corners.at n=31A215365
• The second primorial based variant of arithmetic derivative: a(p) = A034386(p) for p prime, a(u*v) = a(u)*v + u*a(v), with a(0) = a(1) = 0.at n=39A328769
• Expansion of 1/((1 - x)^4 - 2*x^4).at n=14A375164