1 st one … … . 12 nd one … … . 33 rd one … … . 54 th one … … . 75 th one … … . 9… 9 th one … … . 17It looks to me like the 'n'th odd number is always (2 n — 1). In that case, the 200 th odd number is (2 x 200 — 1)=399 . I'll let you check it out and see if that's correct.