OFFSET
1,2
COMMENTS
There are no more terms up to k = 4000 (cf. link).
There are no more terms up to k = 14600. - Jason Earls, Nov 30 2009
REFERENCES
J. Earls, Mathematical Bliss, Pleroma Publications, 2009, page 55. ASIN: B002ACVZ6O [From Jason Earls, Nov 22 2009]
LINKS
EXAMPLE
For k=5, k * 10^k * (10^k - 1)/9 + 1 is the prime 5555500001, so 5 is a term.
PROG
(Magma) [ x[1]: x in [ < n, Integers()!(n*10^n*(10^n - 1)/9 + 1) >: n in [1..186] ] | IsPrime(x[2]) ];
(PARI) is(n)=ispseudoprime(n*10^n*(10^n-1)/9+1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Lekraj Beedassy, Apr 09 2009
EXTENSIONS
Edited by Klaus Brockhaus, Apr 11 2009
a(8) from Herman Jamke (hermanjamke(AT)fastmail.fm), Oct 03 2010
STATUS
approved