Page 120 - Numbertheory

@ @@Hßìÿaö§aI@†a‡Èÿa@óî‹Åä@

A A −2 . ( ) B =2 A +2
.A +2=7 A =5 A −2=3 . .

. 2 + 3 + 5 + 7 = 17

32 119 [Aust.MC 1997] ( )

.5 4 3 2 1 654

14 ( ) 7 ( ) 3 ( ) 1 ( )

:( )

65432 119

. lcm (2, 3, 4, 5,) = 22 × 3× 5 = 60

119,179, 239, ... 959

. 14

n [AMC10B 2002] ( )

30 ( ) 3( ) n 2 − 3n + 2

2( ) 1()

١٠٧