Are you lucky today?
Level
pending
Find the next number in this sequence:
3, 7, 13, 31, 37, _
The answer is 43.
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
This is a sequence with numbers including lucky primes.
A lucky number is a number obtained by the following procedure:
Take the series - 1, 2, 3, 4, 5, 6, 7......
now eliminate every 2nd number
surviving series(Ss) - 1,3, 5,7,9....
now every 3rd
Ss- 1,3,7,9,13,15,19,21....
now every 7th
Ss - 1,3,7,9,13,15,21,25,31,33,37....
Therefore these survivors must be lucky!!
Now take out every prime from the series
3,7,13,31,37,43.......
And hence the answer 43 !!!