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A188719
Number of safe primes < 10^n.
0
2, 7, 25, 115, 670, 4324, 30657, 229568, 1775675, 14156112, 115500275, 960392564
OFFSET
1,1
COMMENTS
Number of safe primes with at most n digits; or a(10^n).
EXAMPLE
a(10^2) = a(100) = #{5, 7, 11, 23, 47, 59, 83} = 7
CROSSREFS
KEYWORD
nonn
AUTHOR
Krzysztof Ostrowski, Apr 09 2011
STATUS
approved