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(2n+1)-digit anti-palindromic numbers or numberdromes, whose first and last digits add to ten, second and next-to-last add to ten and so on with the central digit a 5.
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%I #8 Oct 03 2013 09:31:24

%S 159,258,357,456,555,654,753,852,951,11599,12589,13579,14569,15559,

%T 16549,17539,18529,19519,21598,22588,23578,24568,25558,26548,27538,

%U 28528,29518,31597,32587,33577,34567,35557,36547,37537,38527,39517

%N (2n+1)-digit anti-palindromic numbers or numberdromes, whose first and last digits add to ten, second and next-to-last add to ten and so on with the central digit a 5.

%F a(n) = (10^(m+1))n+5(10^m)+(10^m-n)

%e a(1) = 159 because at least three digits are required, so that n = 1, m = 1 yields a(1) = 100+50+(10-1) = 159

%Y Cf. A083678.

%K easy,nonn,base

%O 0,1

%A _Michael Joseph Halm_, May 13 2004