The Secret Lair

A secret lair has a code to only allow members to enter. The person wanting to enter says a random number, then is told a number in response. In order to enter they must say the correct third number. Here are sequences that allowed entrance.

1 3 5
27 11 6
9 4 4

What’s the third number of this series?

16 7 ?

Five because s-e-v-e-n has 5 letters. The first number can be anything, the second number is the number of letters in the first number, and the third number is the number of letters in the second number.

Posted in Brain Teasers


3 Comments on "The Secret Lair"

Ramon says
August 19, 2022 @ 08:41

I was sure it was something to do with the words :-)

random says
March 16, 2024 @ 11:20

There is a typo in the riddle – the sequence is 1 6 7. 5 would be the 4th number! It occurs in the explanation too – 3 numbers in the sequence – but it is explained as the ‘third’ number in the sequence. This confused me, so can you correct this?

Dan says
March 16, 2024 @ 15:53

There’s no typo. 16 is the first number, 7 is the second number.

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