2) 3 - III, 7 - VII, 12 - XII, 14 - XIV, 25 - XXV, 37 - XXXVII, 42 - XXXXII, 53 - LIII, 66 - LXVI, 89 - LXXXIX, 105 - CV, 110 - CX, 151 - CLI, 200 - CC, 239 - CCXXXIXI, 318 - CCCXVIII, 402 - CCCCII, 515 - DXV, 1200 - MCC, 2563 - MMDLXIII, 3022 - MMMXXII.
3) XI + V = XVI XX - II = XVIII L - IV = XXXXVI CCI + III = CCIV XXXV + IX = XXXXIV CL - VII = CXXXXIII