Page 118 - Numbertheory

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2× 23 = 46, 3× 5 = 15,

3× 7 = 21, 3×11 = 33, 3×13 = 39

5× 7 = 35

.15

80 n ()
1 ()
9

9() 3( ) 2( )

9 n 9 = 3×3 =1×9 : ()
qp n = p 2q 2 n = p 8
.
. p 2q 2
. n = 22 × 32 = 36 28 > 80
80

.( )

p+2 p ( )
.
40 19 713 ( ) 621 ( ) 437 ( )

899 ( )

31 29 23 19 40 19 :( )
31 29
37

. 29×31 = 899

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