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Somer–Lucas pseudoprime

From Wikipedia, the free encyclopedia

In mathematics, in particular number theory, an odd composite number N is a Somer–Lucas d-pseudoprime (with given d ≥ 1) if there exists a nondegenerate Lucas sequence with the discriminant such that and the rank appearance of N in the sequence U(PQ) is

where is the Jacobi symbol.


Unlike the standard Lucas pseudoprimes, there is no known efficient primality test using the Lucas d-pseudoprimes. Hence they are not generally used for computation.

See also

Lawrence Somer, in his 1985 thesis, also defined the Somer d-pseudoprimes. They are described in brief on page 117 of Ribenbaum 1996.


  • Somer, Lawrence (1998). Bergum, Gerald E.; Philippou, Andreas N.; Horadam, A. F. (eds.). "On Lucas d-Pseudoprimes". Applications of Fibonacci Numbers. Springer Netherlands. 7: 369–375. doi:10.1007/978-94-011-5020-0_41.
  • Carlip, Walter; Somer, Lawrence (2007). "Square-free Lucas d-pseudoprimes and Carmichael-Lucas numbers". Czechoslovak Mathematical Journal. 57 (1).
  • Weisstein, Eric W. "Somer–Lucas Pseudoprime". MathWorld.
  • Ribenboim, P. (1996). "§2.X.D Somer-Lucas Pseudoprimes". The New Book of Prime Number Records (3rd ed.). New York: Springer-Verlag. pp. 131–132.
This page was last edited on 13 October 2016, at 08:33
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