181181

Appears in sequences

• Vertically symmetrical dates DDMMYY ("condensed European notation") considered as numbers, in increasing order.at n=4A107276
• Dates after Jan 01 00 in chronological order which are palindromic when they are written in the format DD.MM.YY. The terms are listed as numbers (without the dots). Leading zeros of the terms are suppressed.at n=25A210888
• Palindromes p = A002113(n) whose index n is a substring of p.at n=18A248753
• Triangle read by rows: T(n,k) is the total number of humps with height k in all Motzkin paths of order n, n >= 2 and 1 <= k <= n/2.at n=51A379838