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A037439 Positive numbers n such that the set of base-7 digits of n equals the set of base-9 digits of n. 1
1, 2, 3, 4, 5, 6, 31, 99, 198, 248, 297, 749, 1163, 1471, 1498, 1577, 1831, 2247, 3413, 3988, 4473, 4491, 4500, 4509, 4788, 4789, 4790, 4791, 4792, 4793, 4794, 6769, 7311, 7626, 7698, 7726, 8290, 8299, 8535, 9005, 9038, 9122, 9172, 9185, 9192, 9199, 9248, 9801 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

EXAMPLE

198 is in the sequence because 198 in base 7 is 402 and in base 9 it is 240.

MATHEMATICA

Select[Range[10^4], Union@ IntegerDigits[#, 7] == Union@ IntegerDigits[#, 9] &] (* Michael De Vlieger, Feb 18 2017 *)

PROG

(PARI) isok(n) = Set(digits(n, 7)) == Set(digits(n, 9)); \\ Michel Marcus, Feb 18 2017

CROSSREFS

Subsequence of A037403.

Sequence in context: A091690 A024640 A037403 * A004846 A178579 A237343

Adjacent sequences:  A037436 A037437 A037438 * A037440 A037441 A037442

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

EXTENSIONS

More terms from Don Reble (djr(AT)nk.ca), Apr 28 2006

Edited by John Cerkan, Feb 17 2017

STATUS

approved

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Last modified March 30 04:49 EDT 2017. Contains 284296 sequences.