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Which triangular numbers are prime numbers?
3 is a triangular number that is also prime.Here is a list of some of the first few triangular numbers:0, 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91, 105, 120, 136, 153, 171, 190, 210, 231, 253, 276, 300, 325, 351, 378, 406, 435, 465, 496, 528, 561, 595, 630, 666, 703, 741, 780, 820, 861, 903, 946, 990, 1035, 1081, 1128, 1176, 1225, 1275
Why are the numbers called triangular numbers?
1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91, 105, 120, 136, 153, 171, 190, 210, 231, 253, 276, 300, 325, 351, 378, 406, 435,
What are the prime numbers from 21 to 40?
The prime numbers from 21 to 40 are 23, 29, 31, and 37.
How many composite numbers are there from 101 to 200?
Out of those 100 numbers, 21 of them are prime numbers, so the remaining (100 - 21) = 79 are composite.
How many prime numbers are there from 21 to 35?
There are 3 prime numbers from 21 to 35:23, 29 and 31
Smaller of two triangular numbers whose sum and difference are also triangular numbers?
The answer would be 15 and 21. The triangular numbers are 1,3,6,10,15,21,28,36,45,55,66,78. 15 plus 21 is 36 which is on the list. 21 minus 15 is 6 and that is on the list as well.
Is 21 a triangular number?
Yes, the number 21 is indeed a triangular number. Other triangular numbers are 6,10, and 15.
What is the algebraic expression of 1 3 6 10 15 21?
Triangular numbers follow the form (n^2+n)/2
How can sixth triangular number be 21?
Because it is ! The first 10 triangular numbers are... 1,3,6,10,15,21,28,36,45 & 55
What triangular numbers are greater than 20?
Triangular numbers are generated by the formula ( T_n = \frac{n(n+1)}{2} ). The triangular numbers greater than 20 are 21, 28, 36, 45, and so on. Specifically, the first few triangular numbers greater than 20 are ( T_6 = 21 ), ( T_7 = 28 ), ( T_8 = 36 ), and ( T_9 = 45 ).
What are the next triangular njmbers after 15?
The next triangular numbers after 15 are 21, 28, and 36. Triangular numbers are formed by the formula ( n(n+1)/2 ), where ( n ) is a positive integer. For ( n = 6 ), the triangular number is 21; for ( n = 7 ), it is 28; and for ( n = 8 ), it is 36.
What triangular numbers are equal to the sum of two other triangular numbers?
Thre are infinitely many solutions. The smalest set with two different triangular number adding to another is 6 + 15 = 21
Is 8 triangular number?
No. The first few triangular numbers are 1, 3, 6, 10, 15, 21, 28, ...
Is 17 a triangular number?
No, 17 is not a triangular number. Triangular numbers are generated by the formula ( T_n = \frac{n(n+1)}{2} ), where ( n ) is a positive integer. The triangular numbers near 17 are 15 (for ( n = 5 )) and 21 (for ( n = 6 )), indicating that 17 does not fit into the sequence of triangular numbers.
What are the next four triangular numbers after 15?
21, 28, 36, 45
What are the triangular numbers between 1 and 66?
The triangular numbers between 1 and 66 are: 3, 6, 10, 15, 21, 28, 36, 45 and 55.
Is 32 a triangular number?
32 is not a triangular number. The first few triangular numbers are 1, 3, 6, 10, 15, 21, 28, 36, 45, ...
