Easy but not simple
Level
pending
what is next. 2,3,7,25,121....
823
721
921
1209
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1 solution
1 * 1+1=2
2 * 1+1=3
3 * 2 * 1+1=7
4 * 3 * 2 * 1+1=25
5 * 4 * 3 * 2 * 1+1=121
6 * 5 * 4 * 3 * 2 * 1+1=721