A gardener planted the mangoes trees in a mathematical ordered way (i.e. he planted a tree in rows).
He created the total of 19 rows of trees.
Note: There should be more than 2 trees to count as a row.
What is the minimum number of trees required by the gardener to have 19 rows of trees?
A B C
E F G H
I J K L
M N O P
R S T
5 horizontal rows
4 vertical columns
4 diagonals with slope 1 (ROL, NKH, MJG, IFC)
4 diagonals with slope -1 (SNI, TOJE, PKFA, LGB)
2 knight's move diagonals with slope -2 (AJS, BKT)