It's a multi-layered pattern
Level
pending
The first 19 numbers of a sequence are
Find the 20th term.
The first number is in binary.
The answer is 38.
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
1 solution
The pattern was a sequence of prime numbers but put into a base, which was their term number plus one. So, 2 became 10, 3 became 10, 5 became 11 and so forth.
Thus, we want to find the 20th prime number, which is 71. 71 in base 21 is 38. Therefore, the answer is 38.