A037430 Positive numbers having the same set of digits in base 5 and base 7.

1, 2, 3, 4, 17, 51, 66, 102, 416, 423, 557, 687, 697, 739, 785, 842, 889, 1030, 1078, 1087, 1109, 1233, 1374, 1439, 1444, 1477, 1481, 1492, 1499, 1570, 2527, 2566, 2576, 2580, 2601, 2605, 2611, 2625, 2626, 2627, 2628, 2629, 2811, 2871, 2916

Offset: 1

Author

Clark Kimberling

Keywords

• nonn
• base

Examples

			423 is in the sequence because 423 in base 5 is 3413 and in base 7 it is 1143.
		

Links

• John Cerkan, Table of n, a(n) for n = 1..10000

Crossrefs

Subsequence of A037394.

Programs

Maple

a:=proc(n) if convert(convert(n,base,5),set)=convert(convert(n,base,7),set) then n else fi end: seq(a(n),n=1..3000); # Emeric Deutsch, Apr 30 2006

Mathematica

Select[Range[3000],Union[IntegerDigits[#,5]]==Union[IntegerDigits[#,7]]&] (* Harvey P. Dale, Mar 06 2012 *)

PARI

is(n)=Set(digits(n, 5))==Set(digits(n, 7)) \\ Charles R Greathouse IV, Feb 11 2017

Extensions

More terms from Don Reble, Apr 28 2006

Name edited by John Cerkan, Feb 09 2017