cp's OEIS Frontend

A068636 a(n) = Min(n, R(n)), where R(n) (A004086) = digit reversal of n.

%I A068636 #16 Jun 26 2025 16:27:43
%S A068636 1,2,3,4,5,6,7,8,9,1,11,12,13,14,15,16,17,18,19,2,12,22,23,24,25,26,
%T A068636 27,28,29,3,13,23,33,34,35,36,37,38,39,4,14,24,34,44,45,46,47,48,49,5,
%U A068636 15,25,35,45,55,56,57,58,59,6,16,26,36,46,56,66,67,68,69,7,17,27,37,47,57
%N A068636 a(n) = Min(n, R(n)), where R(n) (A004086) = digit reversal of n.
%C A068636 a(n) = A004185(n) for n <= 100. - _Reinhard Zumkeller_, Apr 03 2015
%H A068636 Alois P. Heinz, <a href="/A068636/b068636.txt">Table of n, a(n) for n = 1..10000</a>
%e A068636 a(12) = min(12,21) = 12. a(34632) = min(34632,23643) = 23643.
%p A068636 a:= n-> min(n,(s-> parse(cat(seq(s[-i], i=1..length(s)))))(""||n)):
%p A068636 seq(a(n), n=1..100);  # _Alois P. Heinz_, Aug 22 2015
%t A068636 Table[Min[n,IntegerReverse[n]],{n,80}] (* The program uses the IntegerReverse function from Mathematica version 10 *) (* _Harvey P. Dale_, Nov 27 2015 *)
%o A068636 (Haskell)
%o A068636 a068636 n = min n $ a004086 n  -- _Reinhard Zumkeller_, Apr 03 2015
%o A068636 (Python)
%o A068636 def A068636(n): return min(n,int(str(n)[::-1])) # _Chai Wah Wu_, Jun 26 2025
%Y A068636 Cf. A068637, A004086, A004185.
%K A068636 base,easy,nonn,look,hear
%O A068636 1,2
%A A068636 _Amarnath Murthy_, Feb 27 2002