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Search: id:A109752
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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
1
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OFFSET
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1,2
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COMMENT
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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
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Index entries for sequences related to dismal arithmetic
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EXAMPLE
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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
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Cf. A087062, A087097.
Adjacent sequences: A109749 A109750 A109751 this_sequence A109753 A109754 A109755
Sequence in context: A024656 A043313 A044910 this_sequence A098755 A028430 A004870
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KEYWORD
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base,fini,full,nonn,less
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AUTHOR
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David Wasserman (wasserma(AT)spawar.navy.mil), Aug 11 2005
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