Exactly 1000 odd-numbers !
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sum = ½ × number of numbers × (first number + last number)
= ½ × (3003 - 1002 + 1) × (1002 + 3003)
= ½ × 2002 × 4005
= 4,009,005
The sum is 4009005.
3003
1221, 2112, 3003, 10401, 11211, 12021
3000
It is: 3003