T-006: $s(13)=4$$s(13)=4$

The case

Results on the case

7 results in the register on $n=13$$n=13$, oldest first, each with what it established and how it stands now.

1. 2005 published T-007

   s(n)≥min(⌈n​⌉,n−2⌊n​⌋+1​+1)$s(n)\ge min(\lceil \sqrt{n}\rceil ,\sqrt{n-2\lfloor \sqrt{n}\rfloor +1}+1)$ for $4\le n\le 324$$4\le n\le 324$

   S3 V0 C1 lower bound incomplete on this case, superseded by T-006

   Nagamochi · Nagamochi 2005 · source · register

2. 2010-09-13 published T-006 this result

   $s(13)=4$$s(13)=4$

   S3 V3 C3 optimality confirmed

   Bentz; Daniel after Burns, Massaccesi · Bentz 2010 · evand square-packing 2026-09-28 · packet · source 1 · source 2 · review · register

3. 2026-08-31 established T-005

   Bentz 2010, Lemma 10 is false as printed and true as corrected to $(1.74,1)$$(1.74,1)$

   S2 V3 C3 correction confirmed

   Levy after Bentz · source · register

4. 2026-09-04 published T-085

   Nagamochi 2005, Lemma 1 is false for every container with $a>3$$a>3$ and $b>2$$b>2$

   S3 V3 C3 correction confirmed

   Karakuş; chelokot · Karakuş 2026 · chelokot Nagamochi counterexample 2026 · packet · register

5. 2026-09-29 published T-058

   Rectangle-certificate ceiling α·UB(n) proved for $n=1$$n=1$..100; B·UB(n) on 64 grid rows

   S2 V3 C3 method limit confirmed

   wand125 after Tokoharu, Daniel · wand125 tools 2026 · packet · register

6. 2026-09-29 published T-083

   s(n)≥1/2+n−⌊n​⌋+1/4​$s(n)\ge 1/2+\sqrt{n-\lfloor \sqrt{n}\rfloor +1/4}$ for every nonsquare $8\le n\le 324$$8\le n\le 324$

   S3 V3 C3 lower bound confirmed on this case, superseded by T-006

   Karakuş · Karakuş 2026 · source · register

7. 2026-10-07 published T-124

   Reported non-strict local minima for 178 source configurations

   S2 V0 C0 restricted optimality recorded

   Daniel after Couzo · Daniel exact and local reports 2026 · packet · register