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A213182 Numbers which may represent a date in "condensed European notation" DDMMYY. 3

%I #27 Feb 12 2015 04:04:25

%S 10100,10101,10102,10103,10104,10105,10106,10107,10108,10109,10110,

%T 10111,10112,10113,10114,10115,10116,10117,10118,10119,10120,10121,

%U 10122,10123,10124,10125,10126,10127,10128,10129,10130,10131,10132,10133,10134,10135,10136,10137,10138,10139,10140

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

%C 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.

%C The sequence is finite, the largest term is a(36525)=311299.

%C There are 366*25 + 365*75 = 36525 possible dates. - _Giovanni Resta_, Feb 28 2013

%e a(1)=10100 represents e.g., Jan 01 1900 or Jan 01 2000.

%e a(100)=10199 (for Jan 01 1999) is followed by a(101)=10200 (for Feb 01 2000).

%e a(1200)=11299 (for Dec 01 1999) is followed by a(1201)=20100 (for Jan 02 2000).

%e 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.

%Y Cf. A213184; A106605, A107273, A107275; A210883, A210884, A210885.

%K nonn,fini

%O 1,1

%A _M. F. Hasler_, Feb 27 2013

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Last modified March 28 05:39 EDT 2024. Contains 371235 sequences. (Running on oeis4.)