Print a bunch of uninteresting numbers!

05AB1E, 3 bytes

Ы*

Explained

Ð    # triplicate input
 «   # conactenate
  *  # multiply

Try it online

JavaScript (ES6), 10 bytes

_=>(_+_)*_

Needs to be called with the argument as a String, not a Number.

Usage:

(_=>(_+_)*_)('3')
99

-3 bytes thanks to @Quill's suggestion.

Java 8, 29 26 25 21 Bytes

God bless lambda

c->new Long(c+""+c)*c

c->Long.decode(c+""+c)*c;