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Prime-Composite numbers : This section explains you about Prime-Composite numbers.2 is the smallest even prime number and 3 is the smallest odd prime number.

The prime numbers up to 100 are :

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71,

73, 79, 83, 89, 97

The first 100 composite numbers are

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.

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.

The twin primes between 1 to 100 are

3-5, 5-7, 11-13, 17-19, 29-31, 41-43, 59-61, 71-73

• Prime-Composite numbers

• Divisibility rules

• Prime Factorization

• H.C.F or G.C.F

• L.C.M

• Application on LCM

Number System

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