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#9 by Harvey P. Dale at Fri Jul 03 12:14:22 EDT 2020
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#8 by Harvey P. Dale at Fri Jul 03 12:14:19 EDT 2020
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| LINKS
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Harvey P. Dale, <a href="/A078262/b078262.txt">Table of n, a(n) for n = 1..369</a>
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| STATUS
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approved
editing
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#7 by Harvey P. Dale at Fri Jul 03 12:12:19 EDT 2020
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#6 by Harvey P. Dale at Fri Jul 03 12:12:16 EDT 2020
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Table[With[{c1=FromDigits[Flatten[IntegerDigits/@Range[n]]], c2= FromDigits[ Flatten[ IntegerDigits/@Range[n, 1, -1]]]}, c1+c2], {n, 20}] (* Harvey P. Dale, Jul 03 2020 *)
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approved
editing
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#5 by N. J. A. Sloane at Thu Dec 05 19:55:57 EST 2013
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| AUTHOR
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_Amarnath Murthy (amarnath_murthy(AT)yahoo.com), _, Nov 24 2002
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Discussion
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| Thu Dec 05
| 19:55
| OEIS Server: https://oeis.org/edit/global/2075
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#4 by Russ Cox at Sat Mar 31 10:23:02 EDT 2012
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| EXTENSIONS
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More terms from _Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), _, Jan 04 2003
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Discussion
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| Sat Mar 31
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| OEIS Server: https://oeis.org/edit/global/354
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#3 by N. J. A. Sloane at Wed Sep 22 03:00:00 EDT 2004
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| KEYWORD
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base,nonn,new
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| EXTENSIONS
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More terms from Sascha Kurz (sascha.kurz(AT)stud.uni-bayreuth.de), Jan 04 2003
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#2 by N. J. A. Sloane at Sat Sep 13 03:00:00 EDT 2003
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| KEYWORD
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base,nonn,new
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| EXTENSIONS
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More terms from Sascha Kurz (ssascha.kurz(AT)tustud.uni-bsbayreuth.de), Jan 04 2003
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#1 by N. J. A. Sloane at Fri May 16 03:00:00 EDT 2003
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| NAME
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Sum of the forward and reverse concatenations of 1 to n.
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| DATA
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2, 33, 444, 5555, 66666, 777777, 8888888, 99999999, 1111111110, 23333333231, 2345555545332, 244567776755433, 25466789897765534, 2647689001998775635, 274869910212099785736, 28497092031222200795837, 2950719304132232301805938
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1,1
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| EXAMPLE
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a(3) = 123 +321 = 444,a(10) = 12345678910 + 10987654321 = 23333333231.
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| CROSSREFS
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Cf. A078263.
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| KEYWORD
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base,nonn
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| AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 24 2002
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| EXTENSIONS
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More terms from Sascha Kurz (s.kurz(AT)tu-bs.de), Jan 04 2003
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| STATUS
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approved
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