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Prime numbers between 55 and 90?
57 - 59 - 61 - 67 - 71 - 73 - 79 - 83 - 87 - 89
What are the odd composite numbers between 70 and 90?
The odd numbers between 70 and 90 are 71, 73, 75, 77, 79, 81, 83, 85, 87, and 89. We know right away that 75 and 85 are composite, since they're divisible by 5. 81 is composite since it is the square of 9. 77 is obviously divisible by 11, so it, too, is composite. 87 is divisible by 3 since 8 + 7 = 15, which is divisible by 3. Therefore, and trust me, I double-checked the rest, 75, 77, 81, 85, and 87 are the composite, odd numbers between 70 and 90.
How many prime numbers are there from 2 to 999?
02, 03, 05, 07, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97100~01, 03, 07, 09, 13, 27, 31, 37, 39, 49, 51, 57, 63, 67, 73, 79, 81, 91, 93, 97, 99200~11, 23, 27, 29, 33, 39, 41, 51, 57, 63, 69, 71, 77, 81, 83, 93300~07, 11, 13, 17, 31, 37, 47, 49, 53, 59, 67, 73, 79, 83, 89, 97400~01, 09, 19, 21, 31, 33, 39, 43, 49, 57, 61, 63, 67, 79, 87, 91, 99500~03, 09, 21, 23, 41, 47, 57, 63, 69, 71, 77, 87, 93, 99600~01, 07, 13, 17, 19, 31, 41, 43, 47, 53, 59, 61, 73, 77, 83, 91700~01, 09, 19, 27, 33, 39, 43, 51, 57, 61, 69, 73, 87, 97800~09, 11, 21, 23, 27, 29, 39, 53, 57, 59, 63, 77, 81, 83, 87900~07, 11, 19, 29, 37, 41, 47, 53, 67, 71, 77, 83, 91, 97
What are the prime numbers greater than 70 but less than 100?
71 73 79 83 89 97.
Are 81 and 87 relatively prime?
No. They are both divisible by 3.
