-99
The Nth triangular number is calculated by: N(N + 1) -------- 2 Hope this is useful!
They are 105, 120, 136, 153, 171 and 190.
25 numbers are between 1-100.
Square: 1, 4, 9, 16, 25, 36, 49. Triangular: 1, 3, 6, 10, 15, 21, 28, 36, 45.
101
The triangular numbers between 1 and 100 are: 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91.
33
because since numbers from 1-100 are smaller then 100-200 making more numbers in 1-100...ex. 78+13=91..while 5152+100=5252! hehe i am smart!
-99
Six.
47 is not a triangular number. Triangular numbers less than 100 are 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, and 91.
Triangle numbers or triangular numbers are those numbers that can form an equilateral triangle when counting the objects. The first five triangular numbers are: 1, 3, 6, 10, 15.
171700
1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91
The nth triangular number is 0.5*n*(n+1)
the numbers betwenn 1 and 365222