1964544domain: NAppears in sequencesSolutions to x+phi(x) = sigma(x)/2.at n=5A099650Numbers k such that A051709(k)/A173557(k) is a positive natural number and a divisor of k.at n=37A344995Expansion of e.g.f. exp(g^4 - 1), where g = 1+x*g^4 is the g.f. of A002293.at n=5A391550