Over the factors of, only and are congruent to . Since must have two digits and must have three, we conclude Indeed, . Therefore, the desired answer is .
Higit sa mga kadahilanan ng, Tanging at ay kapareho sa . Sapagkat / simula ng dapat ay may dalawang numero at kailangang may tatlong, tapusin namin Siyanga, . Samakatuwid, ang nais na sagot ay .