Centered tridecagonal number | Java Program to find nth centered tridecagonal number ; Function to find nth centered tridecagonal number ; Formula to calculate nth centered tridecagonal number ; Driver Code
import java . io . * ; class GFG { static long centeredTridecagonalNum ( long n ) { return ( 13 * n * ( n - 1 ) + 2 ) / 2 ; } public static void main ( String [ ] args ) { long n = 3 ; System . out . println ( centeredTridecagonalNum ( n ) ) ; n = 10 ; System . out . println ( centeredTridecagonalNum ( n ) ) ; } }