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A060209
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Dunckley sequence: number of bases in which composite n is Smith.
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0
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0, 0, 0, 1, 0, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 3, 1, 2, 2, 1, 3, 1, 2, 1, 1, 1, 4, 1, 2, 3, 1, 2, 2, 2, 3, 1, 4, 1, 3, 3, 5, 1, 4, 3, 1, 3, 1, 1, 5, 6, 2, 2, 1, 1, 7, 1, 2, 2, 4, 6, 1, 2, 1, 2, 1, 2, 1, 4, 1, 1, 2, 2, 2, 5, 3, 7, 3, 2, 4, 1, 1, 6, 3, 1, 4, 2, 3, 2, 3, 1, 1, 1, 5, 2, 4, 1, 5, 5, 1, 3, 2, 1, 5, 3, 2
(list; graph; refs; listen; history; internal format)
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OFFSET
| 6,7
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REFERENCES
| A. Vella and D. Vella, On Smith and Dunckley Numbers, Mathematics Today (Bull. Inst. Math. Appl), Vol. 37, no. 2 (2001), 54-56.
A. Vella and D. Vella, More Properties of Dunckley Numbers (in preparation)
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EXAMPLE
| 6, 8, 9 and 12 are not Smith in any base and so d(n) = 0 for these, 10 is Smith only in base 4 so d(10)=1
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CROSSREFS
| A006753.
Sequence in context: A122750 A030421 A085021 * A037830 A174353 A187447
Adjacent sequences: A060206 A060207 A060208 * A060210 A060211 A060212
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KEYWORD
| nonn
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AUTHOR
| Alfred and Dominic Vella (dunckley(AT)thevellas.freeserve.co.uk), Mar 19 2001
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