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First 30 Triangular Numbers

The nth triangle number is equal to the sum of the n natural numbers from 1 to n. In other words, you start with 1 and to get the following number you add the number on the left!
Wikipedia page at http://en.wikipedia.org/wiki/Triangular_number
Quiz by scambigol
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Last updated: July 15, 2014
First submittedJuly 15, 2014
Times taken458
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#
TRIANGULAR NUMBER
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
14
105
15
120
#
TRIANGULAR NUMBER
16
136
17
153
18
171
19
190
20
210
21
231
22
253
23
276
24
300
25
325
26
351
27
378
28
406
29
435
30
465
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