login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A044175 Numbers n such that string 5,2 occurs in the base 7 representation of n but not of n-1. 0
37, 86, 135, 184, 233, 259, 282, 331, 380, 429, 478, 527, 576, 602, 625, 674, 723, 772, 821, 870, 919, 945, 968, 1017, 1066, 1115, 1164, 1213, 1262, 1288, 1311, 1360, 1409, 1458, 1507, 1556, 1605, 1631, 1654, 1703, 1752, 1801 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..42.

MATHEMATICA

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 7], {5, 2}]>0, 1, 0], {n, 2000}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Sep 17 2019 *)

CROSSREFS

Sequence in context: A172193 A141918 A063325 * A044556 A330362 A285803

Adjacent sequences:  A044172 A044173 A044174 * A044176 A044177 A044178

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 19 01:11 EST 2021. Contains 340262 sequences. (Running on oeis4.)