login
A108327
Integers n such that 10^n-21 is a prime number.
3
2, 6, 32, 108, 408, 1286, 2268, 2328, 4284, 53558, 181182, 249010
OFFSET
1,1
COMMENTS
a(13) > 2.5*10^5. - Robert Price, Apr 12 2015
EXAMPLE
6 is a member because 10^6-21 = 1000000-21 = 999979, which is prime.
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Julien Peter Benney (jpbenney(AT)ftml.net), Jun 30 2005
EXTENSIONS
Edited by Ray Chandler, Dec 23 2010
a(10)=53558 from Robert Price, Mar 03 2011
a(11)-a(12) from Kamada data by Robert Price, Apr 12 2015
STATUS
approved