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A073417
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Flawless numbers: numbers without a, f, l or w.
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0
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1, 3, 6, 7, 8, 9, 10, 13, 16, 17, 18, 19, 30, 31, 33, 36, 37, 38, 39, 61, 63, 66, 67, 68, 69, 70, 71, 73, 76, 77, 78, 79, 80, 81, 83, 86, 87, 88, 89, 90, 91, 93, 96, 97, 98, 99, 100, 101, 103, 106, 107, 108, 109, 110, 113, 116, 117, 118, 119, 130, 131, 133
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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1 and 6 seems to be the only numbers that are both flawless and perfect. 7 is the first odd number that is flawless but not perfect.
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REFERENCES
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M. J. Halm, Sequences (Re)discovered, Mpossibilities 81 (Aug. 2002).
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LINKS
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EXAMPLE
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a(3) = 6 because 6 is the third integer without an a, f, l or w.
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CROSSREFS
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KEYWORD
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easy,nonn,word
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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