r2(10^16)≥10462055068612,
r2(10^160)1.0462E155,
r2(10^1600)≥1.0462E1593,
r2(10^16000)≥
1.0462E15991,
r2(10^160000)≥
1.0462E159989,
r2(10^1600000)≥
1.0462E1599987,
r2(10^16000000)≥
1.0462E15999985,
r2(10^160000000)≥
1.0462E159999983,
r2(10^1600000000)≥
1.0462E1599999981,
r2(10^16000000000)≥
1.0462E15999999979 ,