10397407domain: NAppears in sequencesNumbers k such that s(k) + s(k+1) + s(k+2) = t(k) + t(k+1) + t(k+2) where s(k) = sigma(k) - k, t(k) = |s(k) - k|.at n=12A033910Lucas-Carmichael numbers that are not congruent to 11 (mod 12).at n=13A110885