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 A106605 Vertically symmetrical dates DDMMYYYY excluding years which are divisible by 10, considered as numbers, in increasing order. 21
 10011001, 10025001, 10052001, 10088001, 10100101, 10111101, 10125101, 11011011, 11025011, 11052011, 11088011, 11100111, 11111111, 11125111, 12011051, 12025051, 12052051, 12088051, 12100151, 12111151, 12125151, 15011021, 15025021, 15052021 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS 2 and 5 are taken as mirror images (as on calculator displays). a(1)=10011001, a(13)=11111111 and a(38)=20052005 (May 20 2005!) also share the unique property of having two symmetrical halves. This sequence has exactly 70 terms, ending with 28125185 (Dec 28 5185). LINKS Nathaniel Johnston, Table of n, a(n) for n = 1..70 (full sequence) MAPLE compdig := proc(n) if(n=2)then return 5: elif(n=5)then return 2: elif(n=0 or n=1 or n=8)then return n: else return -1: fi: end: for d from 10 to 28 do for m from 1 to 12 do for y from 1 to 8888 do dt:=1000000*d+10000*m+y: dig:=convert(dt, base, 10): if(dig[1]=compdig(dig[8]) and dig[2]=compdig(dig[7]) and dig[3]=compdig(dig[6]) and dig[4]=compdig(dig[5]))then print(dt): fi: od: od: od: # Nathaniel Johnston, May 17 2011 CROSSREFS Cf. A053701. Sequence in context: A139120 A210893 A107273 * A210884 A107275 A210886 Adjacent sequences:  A106602 A106603 A106604 * A106606 A106607 A106608 KEYWORD base,easy,fini,full,nonn AUTHOR Nicolas Graner, Eric Angelini and Alexandre Wajnberg, May 10 2005 EXTENSIONS Definition clarified by Hieronymus Fischer, Apr 01 2012 STATUS approved

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Last modified February 28 04:39 EST 2020. Contains 332321 sequences. (Running on oeis4.)