› $a = 10
10
› sprintf '%.f', $a *= 10**(1/7)
14
› sprintf '%.f', $a *= 10**(1/7)
19
› sprintf '%.f', $a *= 10**(1/7)
27
› sprintf '%.f', $a *= 10**(1/7)
37
› sprintf '%.f', $a *= 10**(1/7)
52
› sprintf '%.f', $a *= 10**(1/7)
72
› sprintf '%.f', $a *= 10**(1/7)
100

› $a = 10
10
› sprintf '%.f', $a *= 10**(1/3)
22
› sprintf '%.f', $a *= 10**(1/3)
46
› sprintf '%.f', $a *= 10**(1/3)
100