143096domain: NAppears in sequencesNumbers n such that phi(4n+1) = sigma(n).at n=21A067234Number of nondecreasing strings of numbers x(i=1..n) in -6..6 with sum x(i)^3 equal to 0.at n=19A188274Numbers k such that [prime(k), prime(k+1), prime(k+2), prime(k+3)] == [1, 2, 3, 4] (mod 11).at n=14A302772