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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A260051 Composites whose prime factorization in base 7 is an anagram of the number in base 7. 11
7136, 9056, 30057, 32076, 40256, 40678, 46400, 71125, 90334, 145152, 150027, 159975, 166281, 177315, 193227, 201057, 207681, 207843, 212000, 218080, 224192, 225195, 229407, 246777, 263031, 265184, 297027, 298144, 298208, 306624, 318096 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Giovanni Resta, Table of n, a(n) for n = 1..10000

EXAMPLE

7136 = 2^5 * 223. In base 7, 26543 = 2^5 * 436.

MATHEMATICA

Select[Range[10^5], !PrimeQ[#] && Sort@ IntegerDigits[#, 7] == Sort@ Flatten@ IntegerDigits[ Select[ Flatten@ FactorInteger@ #, #>1 &], 7] &] (* Giovanni Resta, Jul 14 2015 *)

CROSSREFS

Cf. A260046, A260047, A260048, A260049, A260050, A260052, A260053, A025283, A260054, A260055.

Sequence in context: A269040 A325066 A100539 * A123292 A116180 A252303

Adjacent sequences:  A260048 A260049 A260050 * A260052 A260053 A260054

KEYWORD

base,easy,nonn

AUTHOR

Stephen Tucker, Jul 14 2015

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 April 15 08:58 EDT 2021. Contains 342977 sequences. (Running on oeis4.)