125696

Appears in sequences

• E.g.f.: exp(tan(arcsinh(x))).at n=11A012159
• sinh(tan(arcsinh(x))) = x+2/3!*x^3+16/5!*x^5+216/7!*x^7+6400/9!*x^9...at n=5A012164
• Numbers k whose abundance is 20: sigma(k) - 2*k = 20.at n=6A223611
• Numbers k such that sigma(k) == 0 (mod k+10).at n=7A274565
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 49", based on the 5-celled von Neumann neighborhood.at n=16A285559