Triangular number AND sum of first m factorials

01112018, 10:21 AM
Post: #11




RE: Triangular number AND sum of first m factorials
Thanks Don't let my proof stop your hunt, you'll be able to wile away many hours looking...
I hadn't realised that all square numbers that end in '5' actually end in '25'. I must have seen this before but never noticed or remembered it. Pauli 

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