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A108329
Integers k such that 10^k - 27 is prime.
3
2, 4, 7, 14, 20, 22, 29, 31, 40, 80, 85, 224, 767, 952, 3592, 4016, 4187, 9239, 17684, 20716, 30791
OFFSET
1,1
COMMENTS
See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "99973".
The next term, if one exists, is > 100000. - Robert Price, Apr 25 2011
EXAMPLE
k = 7 is a term because 10^7 - 27 = 10000000 - 27 = 9999973, which is prime.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Julien Peter Benney (jpbenney(AT)ftml.net), Jun 30 2005
EXTENSIONS
a(18)-a(19) from Kamada data by Robert Price, Dec 10 2010
a(20)-a(21) from Robert Price, Dec 15 2010
Edited by Ray Chandler, Dec 23 2010
STATUS
approved