A023070 Positive numbers k such that k and 4*k are anagrams in base 7 (written in base 7).

136, 1254, 1360, 1366, 1436, 10234, 10342, 10452, 12254, 12540, 12544, 12654, 13600, 13624, 13660, 13666, 14360, 14366, 14436, 14562, 100234, 100342, 100452, 101543, 102234, 102340, 102344, 102434, 103420, 103422, 103442, 104342, 104452, 104520

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000

Mathematica

FromDigits[IntegerDigits[#, 7]] & /@ Select[Range[40000], SameQ @@ Sort /@ IntegerDigits[{#, 4*#}, 7] &] (* Amiram Eldar, Aug 07 2025 *)
FromDigits[IntegerDigits[#, 7]]&/@Select[Range[25000], Sort[IntegerDigits[#, 7]]==Sort[IntegerDigits[4#, 7]]&] (* Harvey P. Dale, Dec 29 2025 *)

Crossrefs

Cf. A007093.

Sequence in context: A262091 A251175 A251168 * A015163 A235190 A249985

Adjacent sequences: A023067 A023068 A023069 * A023071 A023072 A023073

Keyword

nonn,base

Author

David W. Wilson

Status

approved