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A210893 Dates after Jan 01 1000 in chronological order which are palindromic when they are written according to the format MMDDYYYY (American standard). Leading zeros of the terms are suppressed. 5
10011001, 1011010, 11011011, 2011020, 12011021, 3011030, 4011040, 5011050, 6011060, 7011070, 8011080, 9011090, 10111101, 1111110, 11111111, 2111120, 12111121, 3111130, 4111140, 5111150, 6111160, 7111170, 8111180, 9111190, 10211201, 1211210, 11211211, 2211220, 12211221 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

There are exactly 331 such palindromic dates between Jan 1 1000 and Dec 31 9999 (see b-file for the complete list).

Dates palindromic in the MMDDYYYY format are also palindromic in the YYYYMMDD format. Consequently, this sequence represents the same dates as A210884.

See A210883 for the number of days after Jan 1 1000 to get such a palindromic date.

The first such palindromic dates after Jan 01 2000 are 10022001, 1022010, 11022011, 2022020, 12022021, 3022030, 4022040, 5022050, 6022060, 7022070, 8022080, 9022090, 10122101, which are the 44th, 45th, ... 56th ... dates of the original sequence.

LINKS

Hieronymus Fischer, Table of n, a(n) for n = 1..331

FORMULA

a(n)=MMDDYYYY_date('Jan 1 1000' + A210883(n)).

n-th date after 'Jan 1 2000' = a(43+n).

EXAMPLE

The first palindromic date in MMDDYYYY format after 'Jan 01 1000' is a(1)=10011001 (= 'Oct 01 1001' = 'Jan 01 1000' + A210893(1) days);

The second palindromic date in MMDDYYYY format after 'Jan 01 1000' is a(2)=1011010=01011010 (= 'Jan 01 1010' = 'Jan 01 1000' + A210893(2) days);

The 47th palindromic date in MMDDYYYY format after 'Jan 01 1000' is a(47)=2022020=02022020 (= 'Feb 02 2020' = 'Jan 01 1000' + A210893(47) days).

The last (331st) palindromic date in MMDDYYYY format before the year 10000 is a(331)=9299290=09299290 (= 'Sep 29 9290' = 'Jan 01 1000' + A210893(331) days).

CROSSREFS

Cf. A210883 - A210892, A210894 - A210895, A106605, A107273, A107275.

Sequence in context: A087510 A173002 A139120 * A107273 A106605 A210884

Adjacent sequences:  A210890 A210891 A210892 * A210894 A210895 A210896

KEYWORD

nonn,base

AUTHOR

Hieronymus Fischer, Apr 01 2012

STATUS

approved

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Last modified November 18 22:33 EST 2019. Contains 329305 sequences. (Running on oeis4.)