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21,

by inserting two 0's in binary format of 7

i.e. 111 = 10101

=21

Manish , your reasoning for the sequence would hold true till 21 .

But the next number is 137 . How would you arrive at that ?

There are a wide array of prime numbers after 21 .

If you have an explanation , please do post it .

And according to my reasoning , 21 is not the answer .

And I did not follow this path of reasoning. :)

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92.. bet thats the right number/s

is not my answer . Though it may be that your answer answers best for you than my answer answers . But for me my answer answers best than your answer .So my answer is that your answer is not my answer and hence try finding a better answer. ;)

Hope that makes it clearer. :lol:

HINT:

Noct was agonisingly close. :)

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is not my answer . Though it may be that your answer answers best for you than my answer answers . But for me my answer answers best than your answer .So my answer is that your answer is not my answer and hence try finding a better answer. ;)

Hope that makes it clearer. :lol:

clear as mud in scotch mist

HINT:

Noct was agonisingly close. :)

Im closer than you realise - same reasoning or different approach!

Will xplain after it has been solved (unless i'm wrong - then I'll dissapear off the face of the earth)

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