- Pythagorean: 9+1+9+1+5+3 = 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: 9+19+18+1+5+12 = 64 (Square Root:8 {6th Fibonacci}, SOD:127 {31st Prime}, PR:311, TR:2
080[208][28 {7th Triangular}])
Other Methods
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