Answer:

4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30, 32, 33,

34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58,

60, 62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85,

86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 98, 99, 100, 102, 104, 105, 106, 108,

110, 111, 112, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125,

126, 128, 129.

Example : 35 and 39

35 = 7 x 5 x 1

39 = 3 x 13 x 1

Both 35 and 39 are composite numbers,the only factor common between them is 1.

∴ 35 and 39 are co-prime numbers.

Some more examples are : 1) 2,3 ; 2) 3,4 3) 5,6 4) 8,13, and so on.

Twin Primes : Two prime number are known as t