67767domain: NAppears in sequencesExpansion of (1-x+2*x^3+x^2)/((1-x)*(2*x+1)*(2*x-1)*(4*x^2+4*x-1)).at n=7A110051Smallest multiple of A047201(n) (i.e., numbers not divisible by 5) with only digits 6 and 7.at n=16A124476Smallest multiple of A047201(n) (i.e., numbers not divisible by 5) with only digits 6 and 7.at n=39A124476