OFFSET
1,3
COMMENTS
It is conjectured that this sequence is infinite, but this has never been proved.
Ratio of successive terms appears to approach sqrt(2). - Bill McEachen, Nov 03 2013
REFERENCES
G. H. Hardy and E. M. Wright, An Introduction to the Theory of Numbers, 5th ed., Oxford Univ. Press, 1979, th. 17.
P. Ribenboim, The Little Book of Big Primes. Springer-Verlag, 1991, p. 190.
LINKS
Eric Weisstein's World of Mathematics, Landau's Problems.
CROSSREFS
KEYWORD
nonn
AUTHOR
Harry J. Smith, May 05 2003
STATUS
approved