Source

project-euler / project-euler / 152 / analysis2.txt

2 => 268304400
3 => 119246400
4 => 67076100
5 => 42928704
6 => 29811600
7 => 21902400
8 => 16769025
9 => 13249600
10 => 10732176
12 => 7452900
13 => 6350400
14 => 5475600
15 => 4769856
18 => 3312400
20 => 2683044
21 => 2433600
24 => 1863225
28 => 1368900
30 => 1192464
35 => 876096
36 => 828100
39 => 705600
40 => 670761
42 => 608400
45 => 529984
52 => 396900
56 => 342225
60 => 298116
63 => 270400
70 => 219024
72 => 207025
TARGET ==
536608800

Must have «2» otherwise the sum cannot hold, so: