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A031882 Repdigital lucky numbers. 1

%I #32 Jul 30 2019 05:31:56

%S 1,3,7,9,33,99,111,777,9999,33333,55555,111111,777777,7777777,55555555

%N Repdigital lucky numbers.

%C a(16) > 10^8. - _Robert G. Wilson v_, May 12 2006

%C a(16) > 10^9. - _Luke March_, Jul 22 2014

%t lst=Range[1, 10^7, 2]; i = 2; While[lst[[i]]<=Length[lst], del=Partition[Range[lst[[i]], Length[lst], lst[[i]]], 1]; lst=Delete[lst, del]; i++ ]; lst=Select[lst, (Length[Union[IntegerDigits[ # ]]]==1)&] (* _Robert G. Wilson v_, May 12 2006 *)

%Y Intersection of A000959 and A010785.

%Y Subset of A309406.

%K base,nonn,more

%O 1,2

%A _Patrick De Geest_

%E Two more terms from Vit Planocka (planocka(AT)mistral.cz), Feb 01 2003

%E a(15) from _Robert G. Wilson v_, May 12 2006

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Last modified May 14 21:33 EDT 2024. Contains 372533 sequences. (Running on oeis4.)