3672178237domain: NAppears in sequencesSeventh column of triangle A067402.at n=6A067407Smallest k such that circle centered at the origin and with radius sqrt(k) passes through exactly 6*n integer points in the hexagonal lattice (see A004016).at n=21A343771a(n) is the smallest positive integer k such that A096936(k) = n.at n=21A374295