Counting Keith numbers.
Klazar, Martin, Luca, Florian (2007)
Journal of Integer Sequences [electronic only]
Similarity:
Klazar, Martin, Luca, Florian (2007)
Journal of Integer Sequences [electronic only]
Similarity:
Kumchev, Angel V. (2008)
Integers
Similarity:
De Koninck, Jean-Marie, Doyon, Nicolas (2003)
Journal of Integer Sequences [electronic only]
Similarity:
Bourdon, Jérémie (2007)
Applied Mathematics E-Notes [electronic only]
Similarity:
Johann Schiffer (1986)
Acta Arithmetica
Similarity:
Greg Martin (2000)
Acta Arithmetica
Similarity:
Walter Philipp (1976)
Acta Arithmetica
Similarity:
Florian Luca, Igor E. Shparlinski (2007)
Colloquium Mathematicae
Similarity:
We show that if a > 1 is any fixed integer, then for a sufficiently large x>1, the nth Cullen number Cₙ = n2ⁿ +1 is a base a pseudoprime only for at most O(x log log x/log x) positive integers n ≤ x. This complements a result of E. Heppner which asserts that Cₙ is prime for at most O(x/log x) of positive integers n ≤ x. We also prove a similar result concerning the pseudoprimality to base a of the Woodall numbers given by Wₙ = n2ⁿ - 1 for all n ≥ 1.
Yann Bugeaud (2007)
Rendiconti del Seminario Matematico della Università di Padova
Similarity:
P. Szüsz (1980)
Acta Arithmetica
Similarity:
R. Hall, G. Tenenbaum (1984)
Acta Arithmetica
Similarity: