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a(n) is the remainder when (n written backwards) is divided by n.
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%I #15 Dec 12 2021 20:13:34

%S 0,0,0,0,0,0,0,0,0,1,0,9,5,13,6,13,3,9,15,2,12,0,9,18,2,10,18,26,5,3,

%T 13,23,0,9,18,27,36,7,15,4,14,24,34,0,9,18,27,36,45,5,15,25,35,45,0,9,

%U 18,27,36,6,16,26,36,46,56,0,9,18,27,7,17,27,37,47,57,67,0,9,18,8,18,28,38

%N a(n) is the remainder when (n written backwards) is divided by n.

%H Rémy Sigrist, <a href="/A103168/b103168.txt">Table of n, a(n) for n = 1..10000</a>

%e a(n) = 0 for palindromic numbers.

%t rd[x_]:=FromDigits[Reverse[IntegerDigits[x]]] Table[Mod[rd[n], n], {n, 1, 256}]

%o (PARI) a(n, base=10) = my (r=fromdigits(Vecrev(digits(n, base)), base)); r%n \\ _Rémy Sigrist_, Apr 05 2020

%o (Python)

%o def a(n): return int(str(n)[::-1])%n

%o print([a(n) for n in range(1, 84)]) # _Michael S. Branicky_, Dec 12 2021

%Y Cf. A071955, A103166-A103169, A002113, A071590.

%K base,nonn

%O 1,12

%A _Labos Elemer_, Jan 28 2005

%E Definition corrected by _N. J. A. Sloane_, Jul 14 2007