A210883 -id:A210883 - cp's OEIS frontend

A210888 Dates after Jan 01 00 in chronological order which are palindromic when they are written in the format DD.MM.YY. The terms are listed as numbers (without the dots). Leading zeros of the terms are suppressed.

101101, 201102, 301103, 11110, 111111, 211112, 21120, 121121, 221122, 31130, 131131, 231132, 41140, 141141, 241142, 51150, 151151, 251152, 61160, 161161, 261162, 71170, 171171, 271172, 81180, 181181, 281182, 91190, 191191, 291192

Offset: 1

Hieronymus Fischer, Apr 01 2012

There are exactly 30 such palindromic dates between Jan 1 00 and Dec 31 99 (see b-file for the complete list).

See A210887 for the number of days after 'Mar 1 00' to get such a palindromic date.

			The first palindromic date in DD.MM.YY format after 'Jan 01 00' is a(1)=101101 (='10.11.01' = 'Nov 10 01' = 'Mar 01 00' + A210887(1) days);
The sixth palindromic date in DD.MM.YY format after 'Jan 01 00' is a(6)=211112 (='21.11.12' = 'Nov 21 12' = 'Mar 01 00' + A210887(6) days).
The last (30th) palindromic date in DD.MM.YY format after 'Jan 01 00' is a(30)=291192 (='29.11.92' = 'Nov 29 92' = 'Mar 01 00' + A210887(30) days).

Hieronymus Fischer, Table of n, a(n) for n = 1..30
Index entries for linear recurrences with constant coefficients, signature (1,0,1,-1).

Cf. A210883 - A210887, A210889 - A210895, A106605, A107273, A107275

a(n) = DDMMYY_date('Mar 1 00' + A210887(n)).
From Chai Wah Wu, Feb 03 2021: (Start)
a(n) = a(n-1) + a(n-3) - a(n-4) for n > 7.
G.f.: x*(100001*x^6 - 391094*x^3 + 100001*x^2 + 100001*x + 101101)/(x^4 - x^3 - x + 1). (End)

A210894 Number of days after Mar 01 00 such that the date written the format MMDDYY (American standard, short) is palindromic.

Original entry on oeis.org

589, 600, 3603, 3614, 4272, 4283, 7255, 7297, 7955, 7966, 10967, 10978, 14651, 14662, 18333, 18344, 22017, 22028, 25699, 25710, 29383, 29394, 33066, 33077

Offset: 1

Hieronymus Fischer, Apr 01 2012

There are exactly 24 such palindromic dates between Jan 1 00 and Dec 31 99 (see b-file for the complete list).
See A210895 for the corresponding dates.
The reference date Mar 1 00 makes sense, since this result in a sequence which is independent from the leap year / non-leap year property of the reference year '00'.

			The first palindromic date in MMDDYY format after 'Jan 01 00' is A210895(1)=101101 (= 'Oct 11 01' = 'Mar 01 00' + 589 days);
The third palindromic date in MMDDYY format after 'Jan 01 00' is A210895(3)=11110=011110 (= 'Jan 11 01' = 'Mar 01 00' + 3603 days);
The 10th palindromic date in MMDDYY format after 'Jan 01 00' is A210895(10)=122221 (= 'Dec 22 21' = 'Mar 01 00' + 7966 days).
The last (24th) palindromic date in MMDDYY format after 'Jan 01 00' is A210895(24)=92290=092290 (= 'Sep 22 90' = 'Mar 01 00' + 33077 days).

Hieronymus Fischer, Table of n, a(n) for n = 1..24

Cf. A210883 - A210893, A210895, A106605, A107273, A107275.

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

Original entry on oeis.org

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

Offset: 1

M. F. Hasler, Feb 27 2013

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

			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.

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

A213184 Numbers which may represent a date in "condensed American notation" MMDDYY.

Original entry on oeis.org

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

Offset: 1

M. F. Hasler, Feb 28 2013

The "may" in the definition should clarify that, e.g., 22900 is in the sequence since it may represent a date (Feb. 29), but not necessarily in any century (e.g., in 2000 but not in 1900), but 22900+k is present only for k=0 (mod 4).

The sequence is finite, with 366*25 + 365*75 terms, cf. comment from G. Resta in A213182. The largest term is a(36525)=123199.

			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 Jan 02 2000).
a(3100)=13199 (for Jan 31 1999) is followed by a(3101)=20100 (for Feb 01 2000).

Cf. A213182, A106605, A107273, A107275; A210883, A210884, A210885.

cp's OEIS Frontend

A210888 Dates after Jan 01 00 in chronological order which are palindromic when they are written in the format DD.MM.YY. The terms are listed as numbers (without the dots). Leading zeros of the terms are suppressed.

Views

Author

Keywords

Comments

Examples

Links

Crossrefs

Formula

A210894 Number of days after Mar 01 00 such that the date written the format MMDDYY (American standard, short) is palindromic.

Views

Author

Keywords

Comments

Examples

Links

Crossrefs

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

Views

Author

Keywords

Comments

Examples

Crossrefs

A213184 Numbers which may represent a date in "condensed American notation" MMDDYY.

Views

Author

Keywords

Comments

Examples

Crossrefs