This is very easy. Simply square the number: 100 squared (100 x 100) = 10,000. So, the sum of the first 100 odd numbers is 10,000.
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There is no "first" odd number because you can start as low as negative infinity and work your way up. If you meant first positive odd numbers, You can do the addition yourself.
The first 20 odd numbers are: 13579111315171921232527293133353739.
The sum of 5 odd numbers must be odd and 100 is even. So there cannot be such a set.
The first 85 odd numbers are: 1 3579111315171921232527293133353739414345474951535557596163656769717375777981838587899193959799101103105107109111113115117119121123125127129131133135137139141143145147149151153155157159161163165167169.
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