OFFSET
1,1
FORMULA
a(n) = PrimePi(10^n) - PrimePi(A092800(n)) = PrimePi(10^n) - PrimePi(A046731(n)/A006880(n)). - Robert G. Wilson v, Jan 19 2007
EXAMPLE
Below 10^1 there are 4 primes: 2 + 3 + 5 + 7 = 17. The rounded mean is 17/4 =~ 4. There are 2 primes > 4: 5 and 7, so a(1) = 2.
CROSSREFS
KEYWORD
nonn
AUTHOR
Enoch Haga, Mar 07 2004
EXTENSIONS
a(9)-a(13) from Robert G. Wilson v, Jan 19 2007
a(14)-a(22) from Amiram Eldar, Jun 14 2024
STATUS
approved