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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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2
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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; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| 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
| Peters, J. and Stein, J., Matematische Tafeln. Revised Russian Edition, 1968, Moscow.
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LINKS
| Eric Weisstein's World of Mathematics, Euler Number
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EXAMPLE
| a(4)=Ceiling[ Log[ 10,1385 ] ]=4, E[ 4 ]=1385 the 4th Zig-number.
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CROSSREFS
| A000364, A034971, A034972, A000182(tangential for comparison..)
Sequence in context: A075692 A112235 A027921 * A125552 A185546 A066026
Adjacent sequences: A047890 A047891 A047892 * A047894 A047895 A047896
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KEYWORD
| nonn,base
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu)
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