# Which number comes next in the sequence?

Hopefully people will find this fun and not too easy.

Which number comes next in the sequence?

-,-,4,3,6,6,3,13,22,?

• What are the first two numbers? Did you mean to not reveal them by putting dashes? Commented Sep 9, 2018 at 17:03
• Yes they are meant to be hidden.
– Simd
Commented Sep 9, 2018 at 17:06
• Just as a suggestion, you should post questions not too often (once or twice a day is fine) so that you can put more effort into making it. You can also combine multiple puzzles into one if they are related :D Commented Sep 10, 2018 at 4:33

Given that the last two numbers can be formed by

$4 + 6 + 3 = 13$ (summing visible number #1, #3, #5)
$3 + 6 + 13 = 22$ (summing visible number #2, #4, #6)

My answer for the next number is

$6 + 3 + 22 = 31$ (summing visible number #3, #5, #7)

This would mean that the first two numbers are the solutions to

$a + 4 + 6 = 6 \implies a = -4$
$b + 3 + 6 = 3 \implies b = -6$

• Can you also fill in the invisible numbers?
– Simd
Commented Sep 11, 2018 at 12:29
• That means the first and second invisible numbers are Rot13(artngvir sbhe naq artngvir guerr, erfcrpgviryl), assuming you are correct (which I am certain you are) :P Commented Sep 11, 2018 at 12:29
• @user477343 That's not the same thing I got (before or after that stealth edit) :)
– hvd
Commented Sep 11, 2018 at 12:33
• I am glad you noticed, because I was originally wrong, heheh :P Commented Sep 11, 2018 at 12:36