129215domain: NAppears in sequencesa(n) = [ a(n-1)/a(1) + a(n-1)/a(2) + ... + a(n-1)/a(n-1) ] for n >= 3, with initial terms 1,2.at n=16A022861a(n) = [ a(n-1)/a(1) + a(n-1)/a(2) + ... + a(n-1)/a(n-1) ] for n >= 3, with initial terms 2,2.at n=17A022867Numbers k such that k and k^2 use only the digits 1, 2, 5, 6 and 9.at n=35A137006