MathDB

47

Part of 2000 Harvard-MIT Mathematics Tournament

Problems(1)

2000 Guts #47:

Source:

10/25/2014
Find an n<100n<100 such that n⋅2n−1n\cdot 2^n-1 is prime. Score will be n−5n-5 for correct nn, 5−n5-n for incorrect nn (00 points for answer <5<5)