What comes next 122436485?

That was a tricky one! Answer: The number 10, followed by 6.

The odd digits are the cardinal numbers: 1, 2, 3, and so on: 122436485.

The even digits are even numbers: 2, 4, 6, 8, and so on: 122436485.

So the pattern would continue thus:

12243648510612714816918102011....

Another way of thinking about it still yields the answer 10. Simply double each cardinal number to get the next digit, thus: 1 doubled is 2, 2 doubled is 4, 3 doubled is 6, 4 doubled is 8, 5 doubled would be 10, then 6 doubled would be 12, and so on.

12243648510612714816918102011221224....