The first 20 odd numbers are: 1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39.
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The answer is 20*20 = 400
25
The first 85 odd numbers are: 1 3579111315171921232527293133353739414345474951535557596163656769717375777981838587899193959799101103105107109111113115117119121123125127129131133135137139141143145147149151153155157159161163165167169.
The sum of the first 1,000 odd numbers is 1,000,000.
The sum of the first 50 odd numbers is 2,500.