But is that multiple divisible by $9$? Not always — e.g., $n = 3$: 3 (div by 3 but not 9), $n = 9$: 9 (div by 9), $n = 15$: 15 (not div by 9). So only guaranteed $3^1$.

Sun, 03 May 2026 15:42:52 +0000

Content under review