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	Triangular numbers that are square		2011-12-27
		Luke pose la question : The “TnS” is a positive integer which is both Triangular number and Square number. For example, 36 is a “TnS” number since 36=1+2+3+4+5+6+7+8 (Triangular number) and 36=6x6 (Square number). What is the next “TnS” which is greater than 36? Penny Nom lui répond.
	A champagne pyramid		2010-03-22
		Kathy pose la question : I have 680 champagne glasses and my pyramid can only be 15 levels high. How many glasses need to be on each level? Is there a formula I can use? Robert Dawson lui répond.
	Triangular Numbers		2009-06-16
		Chinonyerem pose la question : Question from Chinonyerem, a student: Each of the numbers 1 = 1, 3 = 1+2, 6 = 1+2+3, 10 = 1+2+3+4 ,... represents the number of dots that can be arranged evenly in an equilateral triangle:                             .                   .        . .         .         .       . . .             ... .      . .      . . .    . . . . This led the ancient Greeks to call a number TRIANGULAR if it is the sum of consecutive integers, beginning with 1. Prove the following facts concerning triangular numbers: (a) A number is triangular if and only if it is of the form n(n+1)/2 for some n >= 1 (b) The integer n is a triangular number if and only if 8n+1 is a perfect square (c) The sum of any two consecutive triangular numbers is a perfect square (d) If n is a triangular number, then so are 9n+1, 25n+3, and 49n+6 Penny Nom lui répond.
	The number of blocks on the face of a pyramid		2007-06-27
		Heather pose la question : I was wondering if there was an equation in order to calculate the number of blocks on the face of a pyramid. For example: X X X X X X Is there a specific formula in order to calculate that there are 6 blocks here? Thank You, Heather Harley Weston lui répond.
	1, 3, 6, 10...		2006-12-15
		Lisa pose la question : What is the nth term for the sequence, '1, 3, 6, 10...' and could you say how you got the anwser. Stephen La Rocque and Penny Nom lui répond.
	A triangle of 50p pieces		2006-02-22
		Stuart pose la question : Ok, so i am collecting 50p pieces and arranging them on my desk in the shape of a triangle. eg 50p 50p 50p 50p 50p 50p 50p 50p 50p 50p I want to work out how much money I'm saving just by knowing how many rows of coins there are. If i can work out how many coins there are just by knowing how many rows I have I can just divide by 2 to find out the amount in dollars. Penny Nom lui répond.
	Triangular numbers		2002-04-26
		Anika pose la question : Can you please tell me what a triangular number is? Penny Nom lui répond.
	Triangular numbers and square numbers		2000-03-02
		Emily McCallum pose la question : Would someone find me some math activities using triangular numbers and square number. Especially acitivities that actually form the shapes. They need to be at the 5th grade or 6th grade level. But you can not find anything that can be tauht at these level, that fine. I just need to be able to teach this new subject or kind of math to my kids. Rick Seaman and Penny Nom lui répond.
	Cannonballs		1999-01-27
		Roger King pose la question : How many cannonballs can be stacked in a triangular pyramid? Penny Nom lui répond.
	Triangular Numbers		1998-10-30
		Matt pose la question : i would like to know about triangular numbers and it history i would also like to know about the history of prime numbers thank you Chris Fisher lui répond.
	Triangular Numbers.		1997-09-08
		Rachel pose la question : Show visually that the square number 16 is the sum of two triangular numbers. Which two? Penny Nom lui répond.

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