binary code

Hy-Brasil: Legendary ghost island and mysterious UFO coordinates written in binary
It is said that the island is inhabited by saints or is a paradise where advanced civilization is located.
The Arecibo message is the first 'letter' sent to the aliens
Arecibo radio signal is the first message that humanity actively sends out to space. It is a binary code of 1,679 bits - the product of two primes 23 and 73.