16+25 = 41 which is an odd number and also a prime number
625
9, 25, 49 and so on. Prime squares have three factors and other than 4, they are all odd numbers.
1 + 2 + 5 + 10 + 25 + 50 = 93
I assume the question refer to the sum of positive odd numbers up to 25. If so, the answer is 169. If not, please resubmit your question stating exactly what you require.
Yes.
All odd numbers are the sum of two consecutive numbers. Odd multiples of 7 less than 25 are 7 and 21.
16+25 = 41 which is an odd number and also a prime number
The sum of the even numbers is (26 + 28 + ... + 100); The sum of the odd numbers is (25 + 27 + ... + 99) Their difference is: (26 + 28 + ... + 100) - (25 + 27 + ... + 99) = (26 - 25) + (28 - 27) + ... + (100 - 99) = 1 + 1 + ... + 1 There are (100 - 26) ÷ 2 + 1 = 38 terms above which are all 1; their sum is 38 x 1 = 38. So the difference of the sum of all even numbers and all odd numbers 25-100 is 38.
The sum is 1 plus 5 = 6
No two odd numbers can sum to 7.
625
1+3+5+7+9=25
50 has six factors: 1, 2, 5, 10, 25 and 50. Odd factors are 1, 5 and 25. Fraction for the odd factors is 3/6 or 1/2. So it means 1/2 of factors of 50 are odd factors.
The sum of the first n odd numbers is n squared. 25 x 25 = 625
9, 25, 49 and so on. Prime squares have three factors and other than 4, they are all odd numbers.
All the numbers above 2 that are the squares of odd primes have exactly 3 factors: 1, the odd prime, and the odd prime squared. 4, 9, 25, 49, 81, 121,...