OFFSET
1,1
COMMENTS
Prime versus probable prime status and proofs are given in the author's table.
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 - 131.
Makoto Kamada, Prime numbers of the form 133...331.
FORMULA
a(n) = A056244(n+1) + 2.
EXAMPLE
k=7 -> (4*10^(7-1) - 7)/3 = 1333331.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Apr 13 2003
EXTENSIONS
a(13)=42263 from Patrick De Geest, Oct 03 2004
a(14)=111033 from Ray Chandler, Apr 14 2011
Edited by Ray Chandler, Nov 04 2014
STATUS
approved