Until lately I had 1- and 2-socket systems at home — now I won 8× Intel Xeon 8880v3 (100kg !) Lenovo x3950 X6 server on ebay for 399€, with 144C/288T. Power hungry, but the many cores I wanted. PassMark CPU Mark 75,582:.

C++ / I like my commit comment:."Same cross platform behavior: mt19937 because Apple botched random/drand48" .

Nice, first time seen mona-lisa100K.tsp problem with 100,000 cities (and 1,000 USD price money) with #Ruin and #Recreate #greedy solver (#monalisa, #combinatorial #optimization). Initial RR_all() took 301 seconds, more on that in work in progress #RR repo:

Nice:.

"n=11 square packing" 3D model. Minimal known size of the outer square is 3.877084× unit square. I was surprised that #3Dprint⁠ing with factor 3.8771 still allowed for the pieces to fit. Since this is rigid, a different configuration needed for <3.877084×.

Now paper is cited 450 times (with 25 highly influential citations) — article PDF available here:.I just implemented #TSP greedy #Ruin and #Recreate (R&R) from scratch in C++:.#JSCAD app #pcb442 share link:.

Now my #AMD #Vega20 type #GPU⁠s (7× #Instinct #MI50, 1×#Radeon #pro #vii and 1× Radeon vii) totaling to 56.8 TFLOPs FP64. Six MI50s are outside of AMD 7950X (left) and AMD 7600X PCs with 1850W PSUs, 7th MI50 inside right PC (case holes for PSU cables) ….

Nice #einstein #tesselation (#aperiodic #tiling) #Make of @jdegs: .

Bedside lamp shade was broken, so I #3Dprinted a new one. Of course the #C60 #football #fullerene ;-) Since I had its exact 60 vertex coordinates from 3 #golden #ratio vectors in previous model, I used that as basis; and I like it, here #JSCAD share link:.

I will become #student of #Mathematics at #Heidelberg #University in 10/2025. After #second #degree application I got approval notification, and accepted yesterday ;-) I missed last two mathematical colloquium talks (watched youtube links), will visit next

So I created a #JSCAD model for it, with #Mathematica #FindHamiltonianCycle[. ]:.

While visiting #Heidelberg #University two weeks ago, I saw sculpture in front of #Mathematikon building, and realized that it was a #Hamiltonian #cycle of the #C60 football #fullerene.

#Möbius_strip — quadratic #Bezier curve edges if needed to route edge around some area look much nicer:.

Now I learned how to draw graph edges onto a #Möbius_strip. Again the non-planar utility graph K₃,₃ can be embedded onto it. Try out with this #JSCAD share link:.

I used #JSCAD to embed #planar #graph⁠s onto #sphere. Later I learned how to draw graph edges onto a #torus. The non-planar utility graph K₃,₃ can be embedded onto torus. Try out with this JSCAD share link:

Right on track: at age of 60, 5/8/2025 was last workday of active phase of early retirement, after working at IBM for 30 years. In addition to become student of mathematics, the EFF $150,000 prime number award sparked my interest in prime number proofs:.

⢹⣁⣹⠁⠤⠤⡀⢄⠤⢄⠠⡠⠤⡀⢤⠄⢤⠄.⣸⡀⣸⡀⢎⣉⢇⢸⣀⡸⠀⣇⣀⠇⠈⢦⠎⠀.⠀⠀⠀⠀⠀⠀⠀⠼⠄⠀⠠⠧⠀⠀⠠⠜⠀⠀.$ gp -q < <(echo "s=0;for(i=1,9,s+=i^3);s").2025.$.⡇.⠇.⠁.

3.5" drive internal tray removed to make 310mm(!) long #Sapphire #NITRO+ #RX #Vega 64 #GPU fit. 76 USD #ebay auction (0.8 #TFLOP⁠s) GPU missed support bracket. I wanted to 3Dprint something, but few #Lego pieces + some drops of #superglue was quicker .

30 USD on ebay PC + 79 USD auction win #Radeon #Vega 64 #GPU computer just moved to basement compute center. 0.809 TFLOPs GPU #gpuowl for #M_52 biggest known #Mersenne #prime takes only 2226µs/iteration (ETA 3d 12:16 !), twice as fast as 16C/32T #7950X(!):.

Finally an old #gpuowl version runs on old #AMD #Radeon #RX 480 #GPU. Here #PRP sample computation for (smallest working) #Mersenne #prime exponent 19937:.