77630domain: NAppears in sequencesG.f.s of the z^p coefficients of the polynomials in the GF2 denominators of A156925.at n=17A157703G.f.s of the z^p coefficients of the polynomials in the GF2 denominators of A156925.at n=21A157703Weird untouchable numbers.at n=35A357326