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Earn +20 ptsQ: What are the five triangular numbers that follow 21?
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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
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