OFFSET
1,1
COMMENTS
Prime versus probable prime status and proofs are given in the author's table.
a(6) > 2*10^5. - Tyler Busby, Feb 02 2023
REFERENCES
C. Caldwell and H. Dubner, "Journal of Recreational Mathematics", Volume 28, No. 1, 1996-97, pp. 1-9.
LINKS
Patrick De Geest, PDP Reference Table - 141.
Makoto Kamada, Prime numbers of the form 144...441.
FORMULA
a(n) = A056245(n+1) + 2.
EXAMPLE
k=7 -> (13*10^(7-1) - 31)/9 = 1444441.
CROSSREFS
KEYWORD
nonn,base,more
AUTHOR
Patrick De Geest, Apr 13 2003
EXTENSIONS
A new PRP term from Serge Batalov, Nov 02 2008
Edited by Ray Chandler, Nov 04 2014
STATUS
approved