611671domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) = smallest m that generates a rotationally symmetrical XOR-triangle T(m) with a central triangle of zeros with side length n.at n=13A334771a(n) sets a record for side length k of zero-triangle in a rotationally symmetrical XOR-triangle.at n=8A335077Prime numbersat n=49980