1, 3, 5, 7, 9, 11 and just keep adding 2 until you get to 99.
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The sum of all odd numbers from 1 to 64 inclusive is 4,096
5
Look for a table of prime numbers. All the odd numbers that are NOT on this list are composite numbers.
They are: 13579111315171921232527293133353739414345474951535557596163656769717375777981838587899193959799.
101