login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A043987 Numbers k such that 4 and 6 occur juxtaposed in the base-9 representation of k but not of k+1. 0
42, 58, 123, 139, 204, 220, 285, 301, 366, 386, 447, 463, 530, 544, 609, 625, 690, 706, 771, 787, 852, 868, 933, 949, 1014, 1030, 1095, 1115, 1176, 1192, 1259, 1273, 1338, 1354, 1419, 1435, 1500, 1516, 1581, 1597, 1662, 1678 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 9], {4, 6}]>0 || SequenceCount[IntegerDigits[n, 9], {6, 4}]>0, 1, 0], {n, 1700}], {1, 0}] [[All, 1]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jan 25 2017 *)
CROSSREFS
Cf. A007095.
Sequence in context: A080971 A039384 A043207 * A300378 A300680 A053323
KEYWORD
nonn,base
AUTHOR
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 22 18:10 EST 2024. Contains 370260 sequences. (Running on oeis4.)