IMO 1992 LL KOR46

Prove that the sequence 5, 12, 19, 26, 33, . . . contains no term

imolonglistmathematicsolympiad

IMO 1992 LL KOR46

Origin: KOR

Problem

Prove that the sequence 5, 12, 19, 26, 33, . . . contains no term of the form 2n −1.