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24128Re: [PrimeNumbers] seeking numerical example

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  • Maximilian Hasler
    Mar 10, 2012
      On Sat, Mar 10, 2012 at 1:31 PM, Maximilian Hasler
      <maximilian.hasler@...> wrote:
      > On Sat, Mar 10, 2012 at 12:10 PM, Kermit Rose <kermit@...> wrote:
      >> Suppose we wish to look at the special subset of form { z such that z =
      >> (t^2 + 1) = p q, where t is integer, and p and q are primes.}
      > depending on the size of the numbers,
      > I think it's faster to consider products of primes and check whether
      > pq-1 is a square.


      This (in increasing order) is oeis.org/A144255 : semiprimes of the form n^2+1

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