Lambar firam (prime)
Cikakkiyar lamba sama da 1 wadda 1 da ita kanta kaɗai ke rabata daidai: 2, 3, 5, 7, 11, 13 da sauransu.
A cikin mahallin amfani
Lambobin firam a roulette su ne goma sha ɗaya daga cikin lambobi 1 zuwa 36: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29 da 31. Cacar gefecacaCacar gefeƘarin caca na zaɓi da aka haɗa da babban wasa, galibi a kan jerin sakamako iri ɗaya, wani abin kari ko jackpot. Kusan kullum ta fi cace-cacen yau da kullum tsada.Karanta gaba ɗaya → ta Prime Time tana biya a kan jerinsu.
SifilidabaranSifiliRamin kore guda ɗaya da babu cacar ɗaya zuwa ɗaya, ta dozin ko ta ginshiƙi da ke rufe shi; tushen fifikon gidan caca. Ana kuma kiransa: sifili ɗaya, 0.Karanta gaba ɗaya → ba lambar firam ba ce, haka ma 1. Kowace cikakkiyar lamba sama da 1 ko dai lambar firam ce ko kuma sakamakon ninka lambobin firam ta hanya ɗaya tak.