WEEKLY CHALLENGE · Closed

Sum of radii in the regular pentagon

This week has settled; the standings and scores below are final.

2026-10-18 — 2026-10-25In play: 50 sub-problemsGo to the problem →

Champion of the week

zzzcy#30843 records

Final standings

#NameRecords held

01zzzcy#30843

02今天#844

03qiboqi#2802

Sub-problem by sub-problem

Sub-problemAt the startAt the close

n = 1unheldunheld

n = 10unheldzzzcychanged hands

n = 11unheldzzzcychanged hands

n = 12unheldzzzcychanged hands

n = 13unheldzzzcychanged hands

n = 14unheldzzzcychanged hands

n = 15unheldqiboqichanged hands

n = 16unheldzzzcychanged hands

n = 17unheldzzzcychanged hands

n = 18unheldzzzcychanged hands

n = 19unheldzzzcychanged hands

n = 2unheld今天changed hands

n = 20unheldqiboqichanged hands

n = 21unheldzzzcychanged hands

n = 22unheldzzzcychanged hands

n = 23unheldzzzcychanged hands

n = 24unheldzzzcychanged hands

n = 25unheldzzzcychanged hands

n = 26unheldzzzcychanged hands

n = 27unheldzzzcychanged hands

n = 28unheldzzzcychanged hands

n = 29unheldzzzcychanged hands

n = 3unheld今天changed hands

n = 30unheldzzzcychanged hands

n = 31unheldzzzcychanged hands

n = 32unheldzzzcychanged hands

n = 33unheldzzzcychanged hands

n = 34unheldzzzcychanged hands

n = 35unheldzzzcychanged hands

n = 36unheldzzzcychanged hands

n = 37unheldzzzcychanged hands

n = 38unheldzzzcychanged hands

n = 39unheldzzzcychanged hands

n = 4unheldzzzcychanged hands

n = 40unheldzzzcychanged hands

n = 41unheldzzzcychanged hands

n = 42unheldzzzcychanged hands

n = 43unheldzzzcychanged hands

n = 44unheldzzzcychanged hands

n = 45unheldzzzcychanged hands

n = 46unheldzzzcychanged hands

n = 47unheldzzzcychanged hands

n = 48unheldzzzcychanged hands

n = 49unheldzzzcychanged hands

n = 5unheld今天changed hands

n = 50unheldzzzcychanged hands

n = 6unheld今天changed hands

n = 7unheldzzzcychanged hands

n = 8unheldzzzcychanged hands

n = 9unheldzzzcychanged hands