29547domain: NAppears in sequencesa(n) = 5*a(n-1) - 6*a(n-2) + a(n-3) with a(0)=1, a(1)=2, a(2)=7.at n=9A215694a(n) is the least number that reaches 1 after n iterations of the infinitary totient function A064380.at n=35A362025