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

5, 6, 7, 9, 11, 55555, 66666, 77777, 99999, 555555, 666666, 777777, 999999, 5555555, 6666666, 7777777, 9999999, 555555555, 666666666, 777777777, 999999999, 1111111111, 55555555555, 66666666666, 77777777777, 99999999999

Offset

1,1

Comments

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

References

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

Links

Table of n, a(n) for n=1..26.

Example

a(1) = 5 because 5 is the first integer without an h, o, r, t or w.
a(6) = 55555 is the sixth worthless number, read as six-fives

Crossrefs

Sequence in context: A287087 A180939 A229231 * A072956 A241203 A279001

Adjacent sequences: A073416 A073417 A073418 * A073420 A073421 A073422

Keyword

easy,nonn,word,base

Author

Michael Joseph Halm, Aug 23 2002; corrected May 05 2006

Extensions

More terms from Michael Joseph Halm, May 05 2006

Status

approved