75840

Appears in sequences

• (1+e)-sigma perfect numbers: (1+e) - sigma(x) = 2*x.at n=5A049603
• E.g.f.: A(x) = Product_{n>=1} (1 + 4*x^n/n)^n.at n=6A182967
• G.f. satisfies: A(x) = x*exp( Sum_{n>=1} A(2^n*x^n) / n ).at n=5A229901
• Recursive perfect numbers: numbers k such that A333926(k) = 2*k.at n=5A333927
• Numbers k such that A344753(k) is a multiple of A048250(k), and k is a multiple of A344753(k)/A048250(k).at n=12A344755
• Number of directed Hamiltonian paths of the Platonic graphs (in the order of tetrahedral, cubical, octahedral, dodecahedral, and icosahedral graph).at n=4A358960