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Number pattern puzzle

NPK
in Brain Teasers and Puzzles

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10,1,21,12,34,43,51,15,70,7, ?

  • Author

Noone is having a go? :)

 

Hint:

[hide]there are 2 patterns[/hide]

  • Author

another hint

 

[hide]think of prime numbers[/hide]

93,39

 

I cant find the freaking spoiler.

  • Author

Correct! well done :)

the tag for spoiler is [hide]

 

why is that the answer? didnt you say primes? 9 isnt prime...

 

im lost

  • Author

[hide]there are 2 patterns interwoven - the first pattern (1st, 3rd, 5th etc. numbers) starts at 10 and adds the next prime number after 10. So add 11 to get 21; add 13 to get 34; add 17 to get 51; add 19 to get 70; add 23 to get 93.

 

The second pattern (2nd, 4th etc numbers) are simply the reverse of the preceding number.

 

Hope that makes sense!

[/hide]

gotcha...

 

[hide]i was confused because the first digits of the first set of numbers also happen to be the primes. 1,2,3,5,7...[/hide]

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