Algorithmic Numeral · entry 8 Algorithmic encodings for 8. Adjacent 7 · 9 T9 keypad TUV T9 phone-keypad letter set per digit Leet B leet substitution: 0=O, 1=I, 3=E, 4=A, 5=S, 7=T, etc. Math 2 × 2 × 2 prime factorization Previous 7 9 Next