(369) 1

Part of 1993 Tournament Of Towns

Problems(1)

TOT 369 1993 Spring O S1 2^n, delete first digit, again power of 2

Source:

Find all integers of the form

2^n

n

is a natural number) such that after deleting the first digit of its decimal representation we again get a power of

2

number theorypower of 2Digits