Even Perfect Number is Triangular/Proof 2

Theorem

All perfect numbers which are even are triangular.


Proof

Follows from:

Even Perfect Number is Hexagonal
Hexagonal Number is Triangular Number

$\blacksquare$


Sources

  • 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $45$
  • 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $45$
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