Triangular Number 1 - 25

Do you know your triangular numbers up to and including 25? The sequence is T = n(n+1) all divided by 2
Quiz by NoahGBurns
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Last updated: September 22, 2021
First submittedSeptember 22, 2021
Times taken11
Average score96.0%
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When n = ...
T =
1
1
2
3
3
6
4
10
5
15
6
21
7
28
8
36
9
45
10
55
11
66
12
78
13
91
When n = ...
T =
14
105
15
120
16
136
17
153
18
171
19
190
20
210
21
231
22
253
23
276
24
300
25
325
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