| $(B^n(t),\frac{n!}{(n-t)!})$ | $n=5$ | $n=6$ | $n=7$ | $n=8$ | $n=9$ | $n=10$ |
| $t=2$ | $(11,20)$ | $(16,30)$ | $(22,42)$ | $(29,56)$ | $(37,72)$ | $(46,90)$ |
| $t=3$ | $-$ | $-$ | $(92,210)$ | $(141,336)$ | $(205,504)$ | $(286,720)$ |
| $t=4$ | $-$ | $-$ | $-$ | $-$ | $(1339,3024)$ | $(2176,5040)$ |
Permutation codes under the Hamming metric are interesting topics due to their applications in power line communications and block ciphers. In this paper, we study perfect permutation codes in $ S_n $, the set of all permutations on $ n $ elements, under the Hamming metric. We prove the nonexistence of perfect $ t $-error-correcting codes in $ S_n $ under the Hamming metric, for more values of $ n $ and $ t $. Specifically, we propose some sufficient conditions of the nonexistence of perfect permutation codes. Further, we prove that there does not exist a perfect $ t $-error-correcting code in $ S_n $ under the Hamming metric for some $ n $ and $ t = 1,2,3,4 $, or $ 2t+1\leq n\leq \max\{4t^2e^{-2+1/t}-2,2t+1\} $ for $ t\geq 2 $, or $ \min\{\frac{e}{2}\sqrt{n+2},\lfloor\frac{n-1}{2}\rfloor\}\leq t\leq \lfloor\frac{n-1}{2}\rfloor $ for $ n\geq 7 $, where $ e $ is the Napier's constant.
| Citation: |
Table 1.
The values of
| $(B^n(t),\frac{n!}{(n-t)!})$ | $n=5$ | $n=6$ | $n=7$ | $n=8$ | $n=9$ | $n=10$ |
| $t=2$ | $(11,20)$ | $(16,30)$ | $(22,42)$ | $(29,56)$ | $(37,72)$ | $(46,90)$ |
| $t=3$ | $-$ | $-$ | $(92,210)$ | $(141,336)$ | $(205,504)$ | $(286,720)$ |
| $t=4$ | $-$ | $-$ | $-$ | $-$ | $(1339,3024)$ | $(2176,5040)$ |
Table 2.
The values of
| $t$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ | $100$ | $200$ |
| $n_0(t)$ | $5$ | $9$ | $15$ | $22$ | $30$ | $39$ | $49$ | $61$ | $73$ | $5659$ | $22181$ |
| $Un_0(t)$ | $10.5$ | $18.5$ | $28.4$ | $30.4$ | $42.9$ | $52.5$ | $62.8$ | $75.2$ | $88.2$ | $5819.4$ | $22528.4$ |
| $Ln_0(t)$ | $5$ | $7$ | $9.1$ | $14.5$ | $21.0$ | $28.6$ | $36.9$ | $46.9$ | $57.9$ | $5465.8$ | $21760.2$ |
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