Advent calendar 2018
16 December
Arrange the digits 1-9 in a 3×3 square so that the first row makes a triangle number, the second row's digits are all even, the third row's digits are all odd; the first column makes a square number, and the second column makes a cube number.
The number in the third column is today's number.
| triangle | |||
| all digits even | |||
| all digits odd | |||
| square | cube | today's number |