[seqfan] Derangements of N? Integers sharing digits with ranks
Eric Angelini
Eric.Angelini at kntv.be
Fri Jul 30 18:13:20 CEST 2010
Hello SeqFans,
Smallest positive integer a(n) not yet in the sequence S and sharing
no digit with n or (n+1) in its decimal representation:
n = 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25...
S = 3,1,2,6,4,5,9,7,8,22,30,40,20,23,24,25,26,27,33,34,35,10,11,13,...
-----------------------
Smallest positive integer a(n) not yet in the sequence T and sharing
no digit with n, (n-1) or (n+1) in its decimal representation:
n = 1,2,3,4,5,6,7,8, 9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25...
T = 3,4,1,2,7,8,5,6,22,23, 9,40,50,20,27,24,25,26,33,34,35,10,11,16,...
-----------------------
Are S and T (here computed by hand) derangements of N?
Best,
É.
Xref:
http://www.research.att.com/~njas/sequences/A096779
"Smallest number not occurring earlier having no common digits
with n in its decimal representation."
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