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A073419 Worthless numbers: numbers without h, o, r, t, or w. 0


%S 5,6,7,9,11,55555,66666,77777,99999,555555,666666,777777,999999,

%T 5555555,6666666,7777777,9999999,555555555,666666666,777777777,

%U 999999999,1111111111,55555555555,66666666666,77777777777,99999999999

%N Worthless numbers: numbers without h, o, r, t, or w.

%C Of course there cannot be any number that is expressed in any of the usual ways without w, o, r, t or h, between eleven and a googol. "Twelve and the -teens and -ties, factorials" all contains at least one "t". Powers all contain "-to-the-". "Score" or "dozen" or "gross" contain at least an "o". "Hundred" and "thousand" contain at least an "h" and "-illion" contains an "o". Reading digit-by-digit would lead to the duller sequence: 5, 6, 7, 9, 55, 56, 57, 59 and exclude that very worthless number, five-elevens. - _Michael Joseph Halm_, May 05 2006

%D M. J. Halm, Sequences (Re)discovered, Mpossibilities 81 (Aug. 2002).

%e a(1) = 5 because 5 is the first integer without an h, o, r, t or w.

%e a(6) = 55555 is the sixth worthless number, read as six-fives

%K easy,nonn,word,base

%O 1,1

%A _Michael Joseph Halm_, Aug 23 2002; corrected May 05 2006

%E More terms from _Michael Joseph Halm_, May 05 2006

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Last modified June 30 10:15 EDT 2022. Contains 354922 sequences. (Running on oeis4.)