10 91 27 54 23 ? (no giveaway, sorry)

===> Here

The answer to everything is 42.

But seriously, there is no pattern. At least, I can't find any pattern.

Where did you get it from?

4,8,15,16,23,42 :C ?

+81 -64 +27 -31 +19 find a pattern

10 91 27 54 23

if you look at the first three and assign the signs (-.+,+) and divide by 2 you get the 4th

so (-10+91+27)/2 = 54