What is next number in the pattern below:

131 517 192 123 ?

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

What do you see in the given picture?

Living above a star, I do not burn
Eleven friends and they do not turn
I can just be visited in a sequence, not once or repeatedly
PQRS are my initials
Can you tell my name accurately?

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

What has to be broken before you can use it?

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396.

What is the sum of the three digits?

With the help clues provided in the image, can you find the 5 digit key?