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A091127
Number of primes of the form 8k+3 less than 10^n.
4
1, 7, 44, 311, 2409, 19653, 166161, 1440544, 12712340, 113763027, 1029511402, 9401994474, 86516411563, 801235467678
OFFSET
1,2
COMMENTS
Computed by T. D. Noe, Dec 19 2003.
LINKS
Bernhard Helmes, Distribution of Primes
Eric Weisstein's World of Mathematics, Modular Prime Counting Function
MATHEMATICA
p = Select[Table[8 i + 3, {i, 0, 10^7}], PrimeQ[#] &]; Table[Count[p, x_ /; x < 10^n], {n, 7}] (* Robert Price, May 28 2019 *)
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Eric W. Weisstein, Dec 19 2003
EXTENSIONS
a(10) from Robert G. Wilson v, Dec 22 2003
a(11)-a(14) from Bernhard Helmes (pi(AT)devalco.de), Apr 21 2010
STATUS
approved