really curious about it, do you have any idea?
Am I right?
19
1
1 1
10
6 4
100
60 12
1000
840 32
10000
7560 64
100000
83160 128
1000000
720720 240
10000000
8648640 448
100000000
73513440 768
1000000000
735134400 1344
10000000000
6983776800 2304
100000000000
97772875200 4032
1000000000000
963761198400 6720
10000000000000
9316358251200 10752
100000000000000
97821761637600 17280
1000000000000000
866421317361600 26880
10000000000000000
8086598962041600 41472
100000000000000000
74801040398884800 64512
1000000000000000000
856811873911587456 491520

No, for 10^18 correct answer is 897612484786617600 103680

Big thanks! :)

Try using unsigned long long and compute the numbers untill 10^19