The First Number is 1
The Second Number is 3 ( 1+2 )
The Third Number is 6 ( Which is the addition of consecutive dots 1+2+3 )
Formula for finding nth triangular number is nth = n*(n+1) /2
Formula to find whether the given number is traingular number or not 
if n is an integer ,then x is a triangular number (Also n denotes that x is nth triangular number)
if n is not an integer , then x is not a triangular number
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