What are all the common factors of 36 and 48

The listo of the factors of

36: {1; 2; 3; 4; 6; 9; 12; 18; 36}
48: {1; 2; 3; 4; 6; 8; 12; 16; 24; 48}

The common factors: {1; 2; 3; 4; 6; 12}