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 #3 Mar 30 2012 17:31:12
%S 0,1,2,7,8,9,16,19,27,56,61,65,72,91,127,133,215,243,331,342,343,397,
%T 512,657,686,721,737,756,793,919,999,1001,1008,1331,1332,1339,1385,
%U 1727,2232,2322,2331,2662,2744,3159,4069,4097,4376,4472,4608,5409,5707,5831
%N Numbers n such that n and its digit reversal both are difference of (positive or negative) cubes.
%t t1 = Select[ Union[ Flatten[ Table[n^3 - m^3, {n, 35}, {m, -35, n - 1}]]], # < 10^4 && Mod[ #, 10] != 0 &]; t2 = FromDigits /@ Reverse /@ IntegerDigits /@ t1; Take[ Intersection[t1, t2], 51]
%Y Cf. A109879.
%K base,nonn
%O 1,3
%A _Robert G. Wilson v_, Jul 16 2005