WEEKLY CHALLENGE · Running

Sum of radii in the unit circle

This week is running; the numbers below move as records do.

2026-09-27 — 2026-10-04In play: 50 sub-problemsGo to the problem →

Champion of the week

Tmrg#343 records

Live standings

#NameRecords held

01Tmrg#343

02NUE_13#311

Sub-problem by sub-problem

Sub-problemAt the startAt the close

n = 1unheldunheld

n = 10unheldunheld

n = 11unheldunheld

n = 12unheldunheld

n = 13unheldunheld

n = 14unheldunheld

n = 15unheldunheld

n = 16unheldunheld

n = 17unheldunheld

n = 18unheldunheld

n = 19unheldunheld

n = 2unheldunheld

n = 20unheldunheld

n = 21unheldunheld

n = 22unheldunheld

n = 23unheldunheld

n = 24unheldunheld

n = 25unheldunheld

n = 26unheldunheld

n = 27unheldunheld

n = 28unheldunheld

n = 29unheldunheld

n = 3unheldunheld

n = 30unheldunheld

n = 31unheldunheld

n = 32unheldunheld

n = 33unheldunheld

n = 34unheldunheld

n = 35unheldunheld

n = 36unheldunheld

n = 37unheldunheld

n = 38unheldunheld

n = 39unheldunheld

n = 4unheldTmrgchanged hands

n = 40unheldunheld

n = 41unheldunheld

n = 42unheldunheld

n = 43unheldunheld

n = 44unheldunheld

n = 45unheldunheld

n = 46unheldunheld

n = 47unheldunheld

n = 48unheldunheld

n = 49unheldunheld

n = 5unheldNUE_13changed hands

n = 50unheldunheld

n = 6unheldunheld

n = 7unheldTmrgchanged hands

n = 8unheldunheld

n = 9unheldTmrgchanged hands