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Search: id:A047893
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| A047893 |
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Decimal order of Euler (Zig) numbers A000364: a(n) = Ceiling[ Log[ 10,e[ x ] ] ], where e[ x ] = Abs[ EulerE[ 2*n ]. |
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+0
3
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| 0, 1, 2, 4, 5, 7, 9, 11, 13, 15, 17, 20, 22, 25, 27, 30, 32, 35, 38, 41, 44, 46, 49, 52, 55, 58, 61, 64, 68, 71, 74, 77, 80, 84, 87, 90, 94, 97, 100, 104, 107, 111, 114, 118, 121, 125, 128, 132, 135, 139, 143, 146, 150, 154, 157, 161, 165, 168, 172, 176, 180, 183
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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Decimal order (except for powers of 10) gives the number of decimal digits. E.g. a[ 1 ]=0 and E[ 1 ]=1 of 1 digit.
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REFERENCES
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Peters, J. and Stein, J., Matematische Tafeln. Revised Russian Edition, 1968, Moscow.
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LINKS
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Eric Weisstein's World of Mathematics, Euler Number
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EXAMPLE
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a(4)=Ceiling[ Log[ 10,1385 ] ]=4, E[ 4 ]=1385 the 4th Zig-number.
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CROSSREFS
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A000364, A034971, A034972, A000182(tangential for comparison..)
Sequence in context: A075692 A112235 A027921 this_sequence A125552 A066026 A112671
Adjacent sequences: A047890 A047891 A047892 this_sequence A047894 A047895 A047896
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KEYWORD
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nonn,base
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu)
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