24696061952domain: NAppears in sequencesDenominators of the Taylor series of arccosh(z)/sqrt(2(x-1)) about 1.at n=11A091019a(0)=8, a(n) = 2*a(n-1) + 2^(n-1) for n > 0.at n=30A159696Solutions of sigma(sigma(x)) - phi(phi(x)) = 5x.at n=8A246802