A050785 - OEIS

%I #18 Jan 20 2025 12:57:30

%S 11,22,33,44,55,66,77,88,99,111,222,333,444,555,666,777,888,999,1001,

%T 1111,1221,1331,1441,1551,1661,1771,1881,1991,2002,2112,2222,2332,

%U 2442,2552,2662,2772,2882,2992,3003,3113,3223,3333,3443,3553,3663,3773,3883,3993,4004,4114,4224,4334,4444

%N Palindromes containing at least one pair of consecutive equal digits.

%H J.W.L. (Jan) Eerland, <a href="/A050785/b050785.txt">Table of n, a(n) for n = 1..43569</a>

%t Select[Range[3900],Reverse[x=IntegerDigits[#]]==x&&MemberQ[Differences[x],0]&] (* _Jayanta Basu_, Jun 01 2013 *)

%Y Cf. A002113, A050786, A050783.

%K nonn,easy,base,changed

%O 1,1

%A _Patrick De Geest_, Sep 15 1999

%E a(48)-a(53) from _J.W.L. (Jan) Eerland_, Jan 20 2025