The On-Line Encyclopedia of Integer Sequences (OEIS)

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A044431

Numbers n such that string 9,9 occurs in the base 10 representation of n but not of n-1.
(history; published version)

#7 by Harvey P. Dale at Sat Jul 27 11:08:00 EDT 2019

STATUS

editing

approved

#6 by Harvey P. Dale at Sat Jul 27 11:07:57 EDT 2019

MATHEMATICA

SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {9, 9}]>0, 1, 0], {n, 4000}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jul 27 2019 *)

STATUS

approved

editing

#5 by Russ Cox at Fri Mar 30 18:56:44 EDT 2012

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

Clark Kimberling

Discussion

Fri Mar 30

18:56

OEIS Server: https://oeis.org/edit/global/285

#4 by N. J. A. Sloane at Sat Jun 12 03:00:00 EDT 2004

NAME

String Numbers n such that string 9,9 occurs in the base 10 representation of n but not of n-1.

KEYWORD

nonn,base,new

#3 by N. J. A. Sloane at Sat Sep 13 03:00:00 EDT 2003

KEYWORD

nonn,base,new

AUTHOR

Clark Kimberling, (ck6(AT)evansville.edu)

#2 by N. J. A. Sloane at Fri May 16 03:00:00 EDT 2003

NAME

String 9,9 occurs in the base 10 representation of n, but not of n-1.

KEYWORD

nonn,base,new

AUTHOR

Clark Kimberling, ck6@cedar.(AT)evansville.edu

#1 by N. J. A. Sloane at Sat Dec 11 03:00:00 EST 1999

NAME

String 9,9 occurs in the base 10 representation of n, but not of n-1.

DATA

99, 199, 299, 399, 499, 599, 699, 799, 899, 990, 1099, 1199, 1299, 1399, 1499, 1599, 1699, 1799, 1899, 1990, 2099, 2199, 2299, 2399, 2499, 2599, 2699, 2799, 2899, 2990, 3099, 3199, 3299, 3399, 3499, 3599, 3699, 3799, 3899

OFFSET

1,1

KEYWORD

nonn,base

AUTHOR

Clark Kimberling, ck6@cedar.evansville.edu

STATUS

approved