A107276 Vertically symmetrical dates DDMMYY ("condensed European notation") considered as numbers, in increasing order.

101101, 111111, 121151, 151121, 181181, 201105, 211115, 221155, 251125, 281185

Offset

1,1

Comments

2 and 5 are taken as mirror images (as on calculator displays). From now on, the next symmetric date is November 20 2005 (201105). a(1)=101101, a(2)=111111 and a(5)=181181 share the property to present also two symmetrical halves. Next one is November 11 2011 (11 11 11).

Next one is Nov 21 2015 (211115). - M. F. Hasler, Feb 27 2013

Links

Table of n, a(n) for n=1..10.

Prog

(PARI) A107276(n)=101101+[8008, 0, 1001, 2005, 5002][n%5+1]*10+n\6*100004 \\ M. F. Hasler, Feb 28 2013

Crossrefs

Cf. A053701, A106605.

Sequence in context: A122246 A210895 A107274 * A068445 A210888 A115828

Adjacent sequences: A107273 A107274 A107275 * A107277 A107278 A107279

Keyword

base,easy,fini,full,nonn

Author

Alexandre Wajnberg, May 19 2005

Extensions

Edited by Jon E. Schoenfield, Feb 10 2015

Status

approved