1931/1/1: 010131 = 010:131 = each is palindrome
1931/1/2: 020131 = 020:131 = each is palindrome
1931/1/3: 030131 = 030:131 = each is palindrome
1931/1/3: 1331 = palindrome
1931/1/3: 31013 = palindrome
1931/1/3: 3113 = palindrome
1931/1/3: 3131 = cyclic permutation symmetric
1931/1/4: 040131 = 040:131 = each is palindrome
1931/1/5: 050131 = 050:131 = each is palindrome
1931/1/6: 060131 = 060:131 = each is palindrome
1931/1/7: 070131 = 070:131 = each is palindrome
1931/1/8: 080131 = 080:131 = each is palindrome
1931/1/9: 090131 = 090:131 = each is palindrome
1931/1/12: 011231 = 011:231 = integer ratio of 1 to 21
1931/1/13: 13131 = palindrome
1931/1/13: 31113 = palindrome
1931/1/16: 011631 = 01:16:31 = arthimetic series of increment 15
1931/1/30: 13031 = palindrome
1931/1/31: 13131 = palindrome
1931/2/1: 020131 = 020:131 = each is palindrome
1931/2/6: 6231 = 62:31 = integer ratio of 2 to 1
1931/2/12: 021231 = 021:231 = integer ratio of 1 to 11
1931/2/13: 13231 = palindrome
1931/2/13: 31213 = palindrome
1931/3/1: 030131 = 030:131 = each is palindrome
1931/3/1: 1331 = palindrome
1931/3/1: 3131 = cyclic permutation symmetric
1931/3/9: 931931 = cyclic permutation symmetric
1931/3/9: 9331 = 93:31 = integer ratio of 3 to 1
1931/3/10: 031031 = cyclic permutation symmetric
1931/3/10: 310310 = cyclic permutation symmetric
1931/3/13: 13331 = palindrome
1931/3/13: 31313 = palindrome
1931/3/17: 031731 = 03:17:31 = arthimetic series of increment 14
1931/4/1: 040131 = 040:131 = each is palindrome
1931/4/3: 193143 = 19:31:43 = arthimetic series of increment 12
1931/4/13: 13431 = palindrome
1931/4/13: 31413 = palindrome
1931/5/1: 050131 = 050:131 = each is palindrome
1931/5/7: 7531 = 7:5:3:1 = arthimetic series of increment -2
1931/5/13: 13531 = palindrome
1931/5/13: 31513 = palindrome
1931/5/18: 051831 = 05:18:31 = arthimetic series of increment 13
1931/6/1: 060131 = 060:131 = each is palindrome
1931/6/2: 3162 = 31:62 = integer ratio of 1 to 2
1931/6/2: 6231 = 62:31 = integer ratio of 2 to 1
1931/6/13: 13631 = palindrome
1931/6/13: 31613 = palindrome
1931/6/20: 062031 = 062:031 = integer ratio of 2 to 1
1931/6/20: 310620 = 310:620 = integer ratio of 1 to 2
1931/7/1: 070131 = 070:131 = each is palindrome
1931/7/5: 7531 = 7:5:3:1 = arthimetic series of increment -2
1931/7/13: 13731 = palindrome
1931/7/13: 31713 = palindrome
1931/7/19: 071931 = 07:19:31 = arthimetic series of increment 12
1931/8/1: 080131 = 080:131 = each is palindrome
1931/8/13: 13831 = palindrome
1931/8/13: 31813 = palindrome
1931/9/1: 090131 = 090:131 = each is palindrome
1931/9/3: 193193 = cyclic permutation symmetric
1931/9/3: 3193 = 31:93 = integer ratio of 1 to 3
1931/9/3: 931931 = cyclic permutation symmetric
1931/9/3: 9331 = 93:31 = integer ratio of 3 to 1
1931/9/13: 1391931 = palindrome
1931/9/13: 13931 = palindrome
1931/9/13: 31913 = palindrome
1931/9/20: 092031 = 09:20:31 = arthimetic series of increment 11
1931/9/30: 093031 = 093:031 = integer ratio of 3 to 1
1931/9/30: 310930 = 310:930 = integer ratio of 1 to 3
1931/10/1: 311001 = 311:001 = integer ratio of 311 to 1
1931/10/3: 031031 = cyclic permutation symmetric
1931/10/11: 101131 = 101:131 = each is palindrome
1931/11/3: 31113 = palindrome
1931/11/10: 101131 = 101:131 = each is palindrome
1931/11/11: 111131 = 111:131 = each is palindrome
1931/11/12: 121131 = 121:131 = each is palindrome
1931/11/13: 131131 = palindrome
1931/11/13: 131131 = cyclic permutation symmetric
1931/11/13: 131131 = 131:131 = each is palindrome
1931/11/13: 311113 = palindrome
1931/11/14: 141131 = 141:131 = each is palindrome
1931/11/15: 151131 = 151:131 = each is palindrome
1931/11/16: 161131 = 161:131 = each is palindrome
1931/11/17: 171131 = 171:131 = each is palindrome
1931/11/18: 181131 = 181:131 = each is palindrome
1931/11/19: 191131 = 191:131 = each is palindrome
1931/11/21: 112131 = 11:21:31 = arthimetic series of increment 10
1931/12/1: 011231 = 011:231 = integer ratio of 1 to 21
1931/12/2: 021231 = 021:231 = integer ratio of 1 to 11
1931/12/11: 121131 = 121:131 = each is palindrome
1931/12/23: 231231 = cyclic permutation symmetric