1318912domain: NAppears in sequencesNumbers n such that n+cototient(n) is a power of 2.at n=40A053159Nonprimes n such that n+cototient(n) is a power of 2.at n=33A053162a(n) = 2^n*Lucas(n), where Lucas = A000032.at n=12A087131Expansion of g.f. A(x) satisfying A(x) = 1 + 4*x * AGM(1, A(x)^4).at n=6A369536