Boomerang Puzzle © 1973 DEC [Digital Equipment Corp.]
Number-guessing game. The player will need to answer some questions, namely what the remainder is when dividing the number by 3, 5 and 7. The computer will always guess right and it's up to the player to figure out how the computer does it.
The puzzle first appeared in A.D. 90 in Arithmetica by Nicomachus.
Published in July 1973 as a type-in program in the 101 BASIC Computer Games book.