The odd factors of 90 are 1,3,5,9 and 15.
97
The only prime numbers between 81 and 90 is... 83
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.
The numbers 97, 101, 103, 107 and 109 are prime.
The odd factors of 90 are 1,3,5,9 and 15.
The are six such numbers: 18,36,54,72, 90 and 108 .
No. It's even.
70 80 80 80 90 90 100 100 110 110 120 130 160Range = 160 - 70 = 90
99
70 80 80 80 90 90 100 100 110 110 120 130 160Mode = 80
First odd number greater than 20 is 21 Last odd number less than 200 is 199 → number of odd numbers between 20 and 200 is (199 - 21) ÷ 2 + 1 = 90
Since we are talking for the sum of digits, then we are talking about 2-digit numbers between 1 and 100, which are 90 numbers (10 to 99). From these numbers only half of them satisfy the above condition, that is 45 numbers. So 50% of 2-digit numbers between 1 and 100 have an odd sum of their digits.
The sum of two odd numbers is even and the sum of an even number and an odd number is odd.So the sum of three consecutive odd numbers is odd but 270 is even.Ergo there are no three consecutive odd numbers that sum to 270.Three consecutive numbers that sum to 270 are 89, 90, 91.Three consecutive even numbers that sum to 270 are 88, 90, 92.
97
97
The only prime numbers between 81 and 90 is... 83