OFFSET
1,1
COMMENTS
No further terms up to 500000 (see Harvey link). - Ray Chandler, Apr 10 2016
REFERENCES
J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 117, p. 41, Ellipses, Paris 2008.
LINKS
Steven Harvey, Generalized Woodall Search
Prime Pages, Top 20, Generalized Woodall
Prime-Wiki, Generalized Woodall primes of the form n*10^n-1
MATHEMATICA
Do[ If[ PrimeQ[ n*10^n - 1 ], Print[ n ] ], {n, 1, 2500} ]
PROG
(PARI) is(n)=ispseudoprime(n*10^n-1) \\ Charles R Greathouse IV, Mar 01 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Robert G. Wilson v, Feb 05 2001
EXTENSIONS
a(15) - a(17) from Farideh Firoozbakht, Apr 01 2009
a(18) communicated by Jeppe Stig Nielsen, Apr 03 2023
STATUS
approved