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Search: id:A107275
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| A107275 |
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Vertically symmetrical dates YYYYMMDD (metric convention) considered as numbers, in increasing order which here is also the chronological order.80500208. |
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+0
1
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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; listen)
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OFFSET
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10011001,1
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COMMENT
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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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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: A139120 A107273 A106605 this_sequence A155512 A155513 A048938
Adjacent sequences: A107272 A107273 A107274 this_sequence 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 (alexandre.wajnberg(AT)ulb.ac.be), May 19 2005
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