A037430 - OEIS

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

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

EXAMPLE

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

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 *)

PROG

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

CROSSREFS

Subsequence of A037394.

Sequence in context: A359230 A293035 A037394 * A370868 A329545 A187075

Adjacent sequences: A037427 A037428 A037429 * A037431 A037432 A037433

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

EXTENSIONS

More terms from Don Reble, Apr 28 2006

Name edited by John Cerkan, Feb 09 2017

STATUS

approved