[seqfan] Re: Naming issue
Charles Greathouse
charles.greathouse at case.edu
Sun Dec 18 17:22:01 CET 2011
Normally I would call this
Semiprimes n such that n+1 and n+2 are semiprime.
But if you want to use the term semiprime-triple in other sequences,
it would be good to add that to the name, like
Least member of a semiprime-triple: semiprimes n such that n+1 and n+2
are semiprime.
Charles Greathouse
Analyst/Programmer
Case Western Reserve University
On Sun, Dec 18, 2011 at 9:28 AM, Veikko Pohjola <veikko at nordem.fi> wrote:
> Dear seqfans,
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> Much what holds for the sequence of twin primes seems to find its neat analogue in another sequence where 'prime' has been replaced by 'semiprime triple'. I encountered a problem when naming such a sequence having recently submitted one, analogous to A001359 (Lesser of twin primes).
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> I have used "twin semiprime-triple" as the name of the term because it is the shortest that I found and because it retains the analogy to twin prime. To make sure that "semiprime" and "triple" are understood to belong together and to refer to the whole of a semiprime sandwiched between two semiprimes, I inserted a dash in between.
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> The definition of twin semiprime-triple would be: a pair of consequent semiprime triples whose center numbers differ by 4, and which are separated by a non-semiprime always divisible by 36.
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> I would appreciate your comments on this naming issue.
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> Veikko Pohjola
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