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A104339 Numbers n such that n and its digit reversal both are difference of (positive or negative) cubes. 0
0, 1, 2, 7, 8, 9, 16, 19, 27, 56, 61, 65, 72, 91, 127, 133, 215, 243, 331, 342, 343, 397, 512, 657, 686, 721, 737, 756, 793, 919, 999, 1001, 1008, 1331, 1332, 1339, 1385, 1727, 2232, 2322, 2331, 2662, 2744, 3159, 4069, 4097, 4376, 4472, 4608, 5409, 5707, 5831 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
MATHEMATICA
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]
CROSSREFS
Cf. A109879.
Sequence in context: A020675 A317303 A045980 * A199004 A168064 A243167
KEYWORD
base,nonn
AUTHOR
Robert G. Wilson v, Jul 16 2005
STATUS
approved

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Last modified May 25 10:45 EDT 2024. Contains 372788 sequences. (Running on oeis4.)