2091/1/1: 010191 = 010:191 = each is palindrome
2091/1/2: 020191 = 020:191 = each is palindrome
2091/1/3: 030191 = 030:191 = each is palindrome
2091/1/3: 1391 = 13:91 = integer ratio of 1 to 7
2091/1/3: 9113 = 91:13 = integer ratio of 7 to 1
2091/1/4: 040191 = 040:191 = each is palindrome
2091/1/5: 050191 = 050:191 = each is palindrome
2091/1/6: 060191 = 060:191 = each is palindrome
2091/1/6: 1691 = 180 deg rotationally symmetric
2091/1/6: 91016 = 180 deg rotationally symmetric
2091/1/6: 9116 = 180 deg rotationally symmetric
2091/1/7: 070191 = 070:191 = each is palindrome
2091/1/8: 080191 = 080:191 = each is palindrome
2091/1/8: 182091 = 182:091 = integer ratio of 2 to 1
2091/1/9: 090191 = 090:191 = each is palindrome
2091/1/9: 1991 = palindrome
2091/1/9: 91019 = palindrome
2091/1/9: 9119 = palindrome
2091/1/9: 9191 = cyclic permutation symmetric
2091/1/16: 16191 = 180 deg rotationally symmetric
2091/1/16: 91116 = 180 deg rotationally symmetric
2091/1/18: 011891 = 011:891 = integer ratio of 1 to 81
2091/1/19: 19191 = palindrome
2091/1/19: 91119 = palindrome
2091/1/23: 01232091 = 0123:2091 = integer ratio of 1 to 17
2091/1/23: 20910123 = 2091:0123 = integer ratio of 17 to 1
2091/1/30: 013091 = 013:091 = integer ratio of 1 to 7
2091/1/30: 910130 = 910:130 = integer ratio of 7 to 1
2091/2/1: 020191 = 020:191 = each is palindrome
2091/2/19: 19022091 = palindrome
2091/2/19: 19291 = palindrome
2091/2/19: 91219 = palindrome
2091/3/1: 030191 = 030:191 = each is palindrome
2091/3/1: 1391 = 13:91 = integer ratio of 1 to 7
2091/3/19: 19391 = palindrome
2091/3/19: 91319 = palindrome
2091/4/1: 040191 = 040:191 = each is palindrome
2091/4/19: 19491 = palindrome
2091/4/19: 91419 = palindrome
2091/5/1: 050191 = 050:191 = each is palindrome
2091/5/19: 19591 = palindrome
2091/5/19: 91519 = palindrome
2091/6/1: 060191 = 060:191 = each is palindrome
2091/6/1: 1691 = 180 deg rotationally symmetric
2091/6/19: 19691 = palindrome
2091/6/19: 91619 = palindrome
2091/7/1: 070191 = 070:191 = each is palindrome
2091/7/19: 19791 = palindrome
2091/7/19: 91719 = palindrome
2091/8/1: 080191 = 080:191 = each is palindrome
2091/8/1: 182091 = 182:091 = integer ratio of 2 to 1
2091/8/18: 081891 = 081:891 = integer ratio of 1 to 11
2091/8/19: 19891 = palindrome
2091/8/19: 91819 = palindrome
2091/9/1: 090191 = 090:191 = each is palindrome
2091/9/1: 1991 = palindrome
2091/9/1: 9191 = cyclic permutation symmetric
2091/9/2: 2091902 = palindrome
2091/9/10: 091091 = cyclic permutation symmetric
2091/9/10: 910910 = cyclic permutation symmetric
2091/9/19: 19991 = palindrome
2091/9/19: 91919 = palindrome
2091/10/1: 911001 = 911:001 = integer ratio of 911 to 1
2091/10/9: 091091 = cyclic permutation symmetric
2091/10/11: 101191 = 101:191 = each is palindrome
2091/11/6: 91116 = 180 deg rotationally symmetric
2091/11/9: 91119 = palindrome
2091/11/10: 101191 = 101:191 = each is palindrome
2091/11/11: 111191 = 111:191 = each is palindrome
2091/11/12: 121191 = 121:191 = each is palindrome
2091/11/13: 131191 = 131:191 = each is palindrome
2091/11/14: 141191 = 141:191 = each is palindrome
2091/11/15: 151191 = 151:191 = each is palindrome
2091/11/16: 161191 = 180 deg rotationally symmetric
2091/11/16: 161191 = 161:191 = each is palindrome
2091/11/16: 911116 = 180 deg rotationally symmetric
2091/11/17: 171191 = 171:191 = each is palindrome
2091/11/18: 181191 = 181:191 = each is palindrome
2091/11/19: 191191 = palindrome
2091/11/19: 191191 = cyclic permutation symmetric
2091/11/19: 191191 = 191:191 = each is palindrome
2091/11/19: 911119 = palindrome
2091/12/11: 121191 = 121:191 = each is palindrome
2091/12/29: 291291 = cyclic permutation symmetric