Successful / failure that has succeeded in implementing quantum computer development over the past 30 years

Factor Tree of 15
Byjus
15
3
5
24 years ago from IBM to an early quantum computer
15 = 3 x 5
cuemath
Factor Tree of 21
The Math Expert
21
3
7
After 10 years of research
27
=
3 x 7
cuemath
Factor Tree of 35
The Math Expert
35
5
7
But this is still not