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A109752
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Using the dismal product (see A087062 for definition), numbers n such that if n divides a*b, then n must divide either a or b. The multiplicative identity, 9, is excluded by convention.
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0
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OFFSET
| 1,2
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COMMENTS
| This condition is one of the definitions of a prime, so these numbers could be called dismal primes (cf. A087097).
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LINKS
| D. Applegate, M. LeBrun and N. J. A. Sloane, Dismal Arithmetic
Index entries for sequences related to dismal arithmetic
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EXAMPLE
| 90 is a member because the dismal multiples of 90 are the same as the numbers ending with a 0 and if neither a nor b ends in 0, then neither does a*b.
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CROSSREFS
| Cf. A087062, A087097.
Sequence in context: A043313 A171679 A044910 * A098755 A028430 A171717
Adjacent sequences: A109749 A109750 A109751 * A109753 A109754 A109755
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KEYWORD
| base,fini,full,nonn,less
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AUTHOR
| David Wasserman (wasserma(AT)spawar.navy.mil), Aug 11 2005
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