102691domain: NAppears in sequencesa(n) = 4*n^3 - 18*n^2 + 27*n - 12.at n=30A271828Numbers L such that there is a prime p <= L for which v_p(H_L - 1) > 1, where v_p(x) is the p-adic valuation of x and H_L is the L-th harmonic number.at n=6A335207