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Search: id:A034293
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| A034293 |
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Numbers n such that 2^n does not contain the digit 2 (probably finite). |
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+0
10
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| 0, 2, 3, 4, 6, 12, 14, 16, 20, 22, 23, 26, 34, 35, 36, 39, 42, 46, 54, 64, 74, 83, 168
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Is 168 the last term?
First row of A136291. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl) Apr 29 2008
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MAPLE
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isA034293 := proc(n) RETURN(not 2 in convert(2^n, base, 10)) ; end: for n from 0 to 100000 do if isA034293(n) then print(n) ; fi ; od: - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 04 2007
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MATHEMATICA
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Select[ Range@10000, FreeQ[ IntegerDigits[2^# ], 2] &] - Shyam Sunder Gupta (guptass(AT)rediffmail.com), Sep 01 2007
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CROSSREFS
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Cf. A007377.
Sequence in context: A029505 A018309 A039038 this_sequence A136291 A128393 A057919
Adjacent sequences: A034290 A034291 A034292 this_sequence A034294 A034295 A034296
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KEYWORD
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base,nonn,fini
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AUTHOR
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Erich Friedman (erich.friedman(AT)stetson.edu)
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EXTENSIONS
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Edited by N. J. A. Sloane (njas(AT)research.att.com), Oct 03 2007
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