HELP ALICE 2
Level
1
Alice is faced to another question. This time by her father.
What is the lowest possible perfect square triangular number (other than 1)
What is the answer?
The answer is 36.
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1 solution
If you list the triangular numbers we get:
1,3,6,10,15,21,28,36,45,55
Well from here we can clearly see that is 36