372112domain: NAppears in sequencesBeginning of a run of 4 consecutive Niven (or Harshad) numbers.at n=37A141769G.f. A(x) satisfies 1/2 = Sum_{n=-oo..+oo} (-1)^n * x^(2*n) * (A(x) + (-x)^n)^(2*n-1).at n=7A379765