

A213182


Numbers which may represent a date in "condensed European notation" DDMMYY.


3



10100, 10101, 10102, 10103, 10104, 10105, 10106, 10107, 10108, 10109, 10110, 10111, 10112, 10113, 10114, 10115, 10116, 10117, 10118, 10119, 10120, 10121, 10122, 10123, 10124, 10125, 10126, 10127, 10128, 10129, 10130, 10131, 10132, 10133, 10134, 10135, 10136, 10137, 10138, 10139, 10140
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OFFSET

1,1


COMMENTS

The "may" in the definition should clarify that, e.g., 290200 is in the sequence since it may represent a date, but not necessarily in any century.
The sequence is finite, the largest term is a(36525)=311299.
There are 366*25 + 365*75 = 36525 possible dates.  Giovanni Resta, Feb 28 2013


LINKS

Table of n, a(n) for n=1..41.


EXAMPLE

a(1)=10100 represents e.g., Jan 01 1900 or Jan 01 2000.
a(100)=10199 (for Jan 01 1999) is followed by a(101)=10200 (for Feb 01 2000).
a(1200)=11299 (for Dec 01 1999) is followed by a(1201)=20100 (for Jan 02 2000).
The sequence becomes more interesting after the term 281299, since then the numbers DD02YY drop out for DD > 29 and for DD = 29 depending on YY.


CROSSREFS

Cf. A213184; A106605, A107273, A107275; A210883, A210884, A210885.
Sequence in context: A161022 A293686 A267057 * A213184 A267645 A267842
Adjacent sequences: A213179 A213180 A213181 * A213183 A213184 A213185


KEYWORD

nonn,fini


AUTHOR

M. F. Hasler, Feb 27 2013


STATUS

approved



