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A067482
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Powers of 4 with initial digit 4.
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16
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4, 4096, 4194304, 4294967296, 4398046511104, 4503599627370496, 4611686018427387904, 4722366482869645213696, 4835703278458516698824704, 4951760157141521099596496896, 401734511064747568885490523085290650630550748445698208825344
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OFFSET
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1,1
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COMMENTS
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Appearances to the contrary, this sequence is not recursive with a geometric progression factor of 1024. Examples of a(n+1)/a(n) which are not 1024 are a(10)/a(9) = a(20)/a(19) = a(30)/a(29) = a(57)/a(56) = a(67)/a(66) = 2^106 or a(39)/a(38) = a(48)/a(47)= a(86)/a(85) = 2^116. - R. J. Mathar, Jan 10 2008
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LINKS
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FORMULA
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MATHEMATICA
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DeleteCases[Table[If[StringStartsQ[ToString[4^n], "4"], 4^n], {n, 100}], Null] (* Stefano Spezia, Oct 06 2018 *)
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PROG
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(GAP) Filtered(List([0..100], n->4^n), i->ListOfDigits(i)[1]=4); # Muniru A Asiru, Oct 06 2018
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CROSSREFS
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KEYWORD
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base,easy,nonn
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AUTHOR
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STATUS
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approved
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