A031882 Repdigital lucky numbers.

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

Offset: 1

Author

Patrick De Geest

Keywords

• base
• nonn
• more

Comments

a(16) > 10^8. - Robert G. Wilson v, May 12 2006

a(16) > 10^9. - Luke March, Jul 22 2014

Crossrefs

Intersection of A000959 and A010785.

Subset of A309406.

Programs

Mathematica

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 *)

Extensions

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

a(15) from Robert G. Wilson v, May 12 2006