What is the pattern for 3, 19, 99, 499, 2499

Answer 1

3 = 4(5^0) - 1
19 = 4(5^1) - 1
99 = 4(5^2) - 1
499 = 4(5^3) - 1
2499 = 4(5^4) - 1

mmmh?

Answer 2

Answer is Mr Waffles

Answer 3

tell me!

Answer 4

Ghbov