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 A023415 If any power of 2 ends with k 8's and 9's, they must be the first k elements of this sequence in reverse order. 3
 8, 8, 8, 9, 8, 9, 9, 8, 9, 8, 9, 8, 8, 9, 9, 8, 9, 8, 9, 9, 9, 8, 8, 8, 8, 9, 8, 8, 8, 8, 9, 9, 9, 9, 8, 9, 8, 8, 9, 9, 8, 8, 9, 9, 8, 9, 8, 8, 9, 8, 9, 8, 9, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 8, 9, 8, 8, 8, 9, 9, 8, 8, 9, 8, 8, 9, 9, 8, 8, 9, 9, 9, 8, 9, 9, 9, 9, 9, 9, 8, 8, 9, 8, 8, 9, 9, 9, 9, 9, 9, 8, 8, 8, 9, 9, 8, 8, 8 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Upper limit of backward value of 2^n and n!. - Simon Plouffe, Mar 23 2009 LINKS PROG (Python) # upper limit of backward value of 2^n a, i=8, 0; x=a while 1:      i+=1; print x, ', ' ,      if a%2**(i+1) == 0: x=8      else: x=9      a=a+x*10**i # Cezary Glowacz, Mar 11 2017 CROSSREFS Sequence in context: A248762 A186985 A203127 * A294659 A134314 A242891 Adjacent sequences:  A023412 A023413 A023414 * A023416 A023417 A023418 KEYWORD nonn,base AUTHOR STATUS approved

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