110170domain: NAppears in sequencesNumbers such that the digital sums in bases 2, 3, 5 and 10 all are equal.at n=24A135128Numbers k such that k and k+17 have same sum of divisors.at n=18A172335Coefficient of x in the reduction by x^2 -> x+1 of the polynomial p(n,x) defined at Comments.at n=20A192970