1986/1/6: 010686 = 010:686 = each is palindrome
1986/1/12: 011286 = 011:286 = integer ratio of 1 to 26
1986/2/6: 020686 = 020:686 = each is palindrome
1986/2/15: 860215 = 860:215 = integer ratio of 4 to 1
1986/2/22: 022286 = 022:286 = integer ratio of 1 to 13
1986/3/4: 4386 = 43:86 = integer ratio of 1 to 2
1986/3/6: 030686 = 030:686 = each is palindrome
1986/3/11: 031186 = 031:186 = integer ratio of 1 to 6
1986/3/31: 03311986 = 0331:1986 = integer ratio of 1 to 6
1986/3/31: 19860331 = 1986:0331 = integer ratio of 6 to 1
1986/4/2: 8642 = 8:6:4:2 = arthimetic series of increment -2
1986/4/3: 4386 = 43:86 = integer ratio of 1 to 2
1986/4/3: 8643 = 86:43 = integer ratio of 2 to 1
1986/4/6: 040686 = 040:686 = each is palindrome
1986/4/20: 86420 = 8:6:4:2:0 = arthimetic series of increment -2
1986/4/30: 043086 = 043:086 = integer ratio of 1 to 2
1986/4/30: 860430 = 860:430 = integer ratio of 2 to 1
1986/5/6: 050686 = 050:686 = each is palindrome
1986/6/1: 010686 = 010:686 = each is palindrome
1986/6/2: 020686 = 020:686 = each is palindrome
1986/6/3: 030686 = 030:686 = each is palindrome
1986/6/4: 040686 = 040:686 = each is palindrome
1986/6/5: 050686 = 050:686 = each is palindrome
1986/6/6: 060686 = 060:686 = each is palindrome
1986/6/7: 070686 = 070:686 = each is palindrome
1986/6/8: 080686 = 080:686 = each is palindrome
1986/6/8: 6886 = palindrome
1986/6/8: 86068 = palindrome
1986/6/8: 8668 = palindrome
1986/6/8: 8686 = cyclic permutation symmetric
1986/6/9: 090686 = 090:686 = each is palindrome
1986/6/21: 062186 = 062:186 = integer ratio of 1 to 3
1986/7/6: 070686 = 070:686 = each is palindrome
1986/8/6: 080686 = 080:686 = each is palindrome
1986/8/6: 6886 = palindrome
1986/8/6: 8686 = cyclic permutation symmetric
1986/8/14: 081486 = 081:486 = integer ratio of 1 to 6
1986/9/6: 090686 = 090:686 = each is palindrome
1986/10/1: 861001 = 861:001 = integer ratio of 861 to 1
1986/10/3: 861003 = 861:003 = integer ratio of 287 to 1
1986/10/7: 861007 = 861:007 = integer ratio of 123 to 1
1986/10/16: 101686 = 101:686 = each is palindrome
1986/10/21: 861021 = 861:021 = integer ratio of 41 to 1
1986/11/3: 031186 = 031:186 = integer ratio of 1 to 6
1986/11/16: 111686 = 111:686 = each is palindrome
1986/11/23: 861123 = 861:123 = integer ratio of 7 to 1
1986/12/1: 011286 = 011:286 = integer ratio of 1 to 26
1986/12/16: 121686 = 121:686 = each is palindrome