A260051 Composites whose prime factorization in base 7 is an anagram of the number in base 7.

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

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