# Where do I end up?

Given this streak of numbers:

1 2 11 4 101 6 111 8 1001 10 1011 12 1101 14 1111 16 ? ?


What will the last 2 numbers at the question marks be?

Hint:

Positional notation

It is most likely 17 in decimal or binary but you shift between each until the end.

Binary + Decimal (missing 8 and 9?) 1 2 3 4 5 6 7 10 11 12 13 14 15 16 ?? 17 or 00010001

• Same comment as @lorimer. Plus: the question asks for 2 numbers following the sequence :) – User2910293 May 9 '15 at 15:56
• 1. I posted first and 2. not the same answer so not "same comment" – Daedric May 9 '15 at 16:02
• I didn't know this was a competition :P. I was just commenting his answer first; no real intention behind that ;). Yours is the correct answer tho :) – User2910293 May 9 '15 at 16:03
• Ok thanks, I also got the impression we where both wrong just now. Sorry about that. – Daedric May 9 '15 at 16:06
• how is this correct when it only gives a single number following the sequence? (why this matters: if this is solved then I'd rather not waste effort trying to find the miniscule difference in mine) – lorimer May 9 '15 at 16:43

10001 20

It's binary, but I wonder if you missed 8 and 9. If not, then the above should be right.

• The ones you saying are missing aren't. Just as you noted the end-result, the pattern is correct. Your literal answer isn't correct tho. Look closer ;) – User2910293 May 9 '15 at 15:55