Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #19 Apr 15 2021 01:01:44
%S 0,1,2,3,4,5,6,7,8,9,101,11,121,131,141,151,161,171,181,191,202,212,
%T 22,232,242,252,262,272,282,292,303,313,323,33,343,353,363,373,383,
%U 393,404,414,424,434,44,454,464,474,484,494,505
%N Smallest palindrome beginning with n.
%H T. D. Noe, <a href="/A082216/b082216.txt">Table of n, a(n) for n = 0..10000</a>
%F a(A002113(n)) = A002113(n). - _Chai Wah Wu_, Apr 13 2021
%o (Python)
%o def A082216(n):
%o s = str(n)
%o t = s[::-1]
%o if s == t:
%o return n
%o for i in range(1,len(s)):
%o if s[i:] == t[:-i]:
%o return int(s+t[-i:]) # _Chai Wah Wu_, Apr 13 2021
%Y Cf. A002113, A056544.
%K base,easy,nonn
%O 0,3
%A _Amarnath Murthy_, Apr 08 2003
%E Corrected by _T. D. Noe_, Mar 10 2011
%E a(0) added by _Chai Wah Wu_, Apr 14 2021