Created
February 1, 2016 17:18
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Triangle number check
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| function isTriangleNumber(number) { | |
| if (isNaN(number) || number != parseInt(number, 10)) return false; | |
| else if (number == 0 || number == 1) return true; | |
| else | |
| var m = (Math.sqrt(8*number+1) - 1) / 2; | |
| if (m != parseInt(m,10)) return false; | |
| else return true; | |
| } |
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