22-01-2009 Consecutive Composites!

Show that for any number n, there are consecutive n composites that exist...

This is not an olympiad question.... It is very much from the JEE syllabus.. Just that you have to think a bit.. (hint think of n!)

39 Answers

1
Philip Calvert ·

sorry can't get the ques [7]

where do the n composites have to exist ?

11
Anirudh Narayanan ·

Not even after reading post #3 [2]

62
Lokesh Verma ·

you have to prove that among Natural numbers, there are consecutive "n" composite numbers for every value of n

Like 8,9,10 are 3 consecutive composite numbers

24,25,26,27,28 are 5 consecutive composite numbers...

So

a,a+1, a+2.... a+n-1 are n consecutive numbers..

1
Philip Calvert ·

ok nishant bhaiyya can u tell me one thing ---

does the proof you are going to give imply that the
first "consecutive n composites that exist" will be less than n!

if this is not so i might as well log off and sleep for a while

1
voldy ·

composites are ones which are not prime no ?

9
Celestine preetham ·

k got it

n!+2 to (n+1)! are composites

9
Celestine preetham ·

it would ve been tough if u hadnt given clue

1
Philip Calvert ·

@ celestine
what abt n = 1
or n = 2
or what abt 3
i don ubderstand what u mean celes

1
Honey Arora ·

this is nt true for n=1 bt true for n=2 nd so on..........

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