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A107275
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Vertically symmetrical dates YYYYMMDD (metric convention) for years >=1000, considered as numbers, in increasing order which here is also the chronological order.
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15
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10011001, 10100101, 10111101, 10200501, 10500201, 10511201, 10800801, 11011011, 11100111, 11111111, 11200511, 11500211, 11511211, 11800811, 15011021, 15100121, 15111121, 15200521, 15500221, 15511221, 15800821
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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A little over 30 years ago, almost all nations agreed (...) on the (adoption and) use of the "metric system". For example, April 7, 1975, is expressed as 1975 04 07 (R. K. Guy)
This sequence has exactly 84 terms, ending with 85800828 (8580 August 28th).
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LINKS
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Table of n, a(n) for n=1..21.
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EXAMPLE
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2 and 5 are taken as mirror images (as on calculator displays). a(1)=10011001 and a(10)=11111111 shared the property to present also two symmetrical halves.
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CROSSREFS
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Cf. A053701, A106605.
Sequence in context: A107273 A106605 A210884 * A210886 A179507 A155512
Adjacent sequences: A107272 A107273 A107274 * A107276 A107277 A107278
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KEYWORD
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base,easy,fini,nonn
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AUTHOR
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Alexandre Wajnberg, May 19 2005
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EXTENSIONS
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Definition clarified by Hieronymus Fischer, Apr 01 2012
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STATUS
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approved
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