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Search: id:A060792
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| A060792 |
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Numbers that are palindromic in bases 2 and 3. |
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+0
4
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| 1, 6643, 1422773, 5415589, 90396755477, 381920985378904469, 1922624336133018996235
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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6643 is okay, since 6643 is (1100111110011) in base 2 and (1001001) in base 3
Base2::1422773=101011011010110110101 Base3::1422773=2200021200022 [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Sep 19 2009]
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MATHEMATICA
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f2[n_Integer]:=IntegerDigits[n, 2]==Reverse[IntegerDigits[n, 2]]; f3[n_Integer]:=IntegerDigits[n, 3]==Reverse[IntegerDigits[n, 3]]; lst={}; Do[If[f2[n]&&f3[n], AppendTo[lst, n]], {n, 12!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Sep 19 2009]
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CROSSREFS
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A060792(2) = A048268(2) = A056749(3)
Sequence in context: A164971 A048268 A043634 this_sequence A119519 A131645 A015310
Adjacent sequences: A060789 A060790 A060791 this_sequence A060793 A060794 A060795
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KEYWORD
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nonn,base
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AUTHOR
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Ulrich Schimke (ulrschimke(AT)aol.com)
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EXTENSIONS
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a(6) found by Francois Boisson, using a Caml program running on an AMD-64 machine. - Bruno Petazzoni, program co-author, Jan 31 2006. a(7) from the same source, May 26, 2006
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