algorithm: Pronic number

math/pronicnumber.go

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+// pronicnumber.go
+// description: Returns true if the number is pronic and false otherwise
+// details:
+//  Pronic number: For any integer n, if there exists integer m
+//  such that n = m * (m + 1) then n is called a pronic number.
+// wikipedia: https://en.wikipedia.org/wiki/Pronic_number
+// author: Akshay Dubey (https://github.com/itsAkshayDubey)
+// see pronicnumber_test.go
+
+package math
+
+import stdMath "math"
+
+// PronicNumber returns true if argument passed to the function is pronic and false otherwise.
+func PronicNumber(n int) bool {
+	if n < 0 || n%2 == 1 {
+		return false
+	}
+	x := int(stdMath.Sqrt(float64(n)))
+	return n == x*(x+1)
+}