- Pythagorean: 5+4+5+1+9+4 = 28 (7th Triangular, SOD:56, PR:1
07[17 {7th Prime}] TR:406[46 {SOD:72, PR:199, TR:1081[181 {42nd Prime}]}], Perfect Number) - Simple: 5+4+23+1+18+4 = 55 (1
0th Triangular, 10th Fibonacci, SOD:72, PR:257, TR:1540[154])
Other Methods
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