If the number is an inline 6, the number sequence is normally 1-5-3-6-2-4. This ignition sequence should work for almost every inline six-cylinder engine built by any car manufacturer. It is one of the few engine configurations that always maintains a consistent firing sequence. You can read full guide here: https://nerdycar.com/6-cylinder-engine-firing-order/
Straight-six engines attain the best primary and auxiliary balance by firing in the order 1-5-3-6-2-4. A firing order of 1-2-4-6-5-3, on the other hand, is frequently felt on Isuzu 6-cylinder engine cars operating at medium speeds.