OFFSET
1,1
COMMENTS
Rotkiewicz proves that a(n) < A175736(n)^2, and that the exponent can be replaced by 1 + epsilon for large enough n.
REFERENCES
A. Rotkiewicz, "Les intervalles contenants les nombres pseudopremiers", Rendiconti del Circolo Matematico di Palermo, Series 2, 14 (1965), pp. 278-280.
LINKS
Charles R Greathouse IV, Table of n, a(n) for n = 1..207
Charles R Greathouse IV, Illustration of gap sizes vs. lower end
H. Halberstam and A. Rotkiewicz, A gap theorem for pseudoprimes in arithmetic progression, Acta Arithmetica 13 (1967/1968), pp. 395-404.
Eric Weisstein's World of Mathematics, Fermat Pseudoprime
CROSSREFS
KEYWORD
nonn,nice
AUTHOR
Charles R Greathouse IV, Aug 28 2010
STATUS
approved