On 10.09.21 10:59, Dom DiSc wrote: > On Friday, 10 September 2021 at 02:57:37 UTC, jfondren wrote: >> assert(find_gcd([3, 5, 12, 15]) == 3); > > Maybe a little off topic, but since when is gcd(3,5) != 1 ?? > You're program seems to have some bugs... It's not computing the gcd of the list, just the gcd of its minimum and maximum.