Natural (whole) numbers are 1,2,3, and so on.
A natural number less than 7 is 1,2,3,4,5,6. Sometimes zero is included.
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The odd natural numbers less than 11 are 1, 3, 5, 7, and 9.
counting numbers greater than 1but less than 10 = 2, 3, 4, 5, 6, 7, 9
Oh, dude, you want me to list out all the prime numbers less than 18? Like, seriously? Okay, fine. Here we go: 2, 3, 5, 7, 11, 13, 17. There you have it, all the prime numbers less than 18. Happy now?
2 3 5 7 11 13 17 19.
2,3,5 and 7.