A091125 Number of primes of the form 7k+6 less than 10^n.

0, 4, 27, 200, 1596, 13090, 110776, 960640, 8474742, 75842786, 686348604, 6267986759, 57677620740, 534156999352

Offset

1,2

Comments

Computed by T. D. Noe, Dec 19 2003.

Links

Table of n, a(n) for n=1..14.

Eric Weisstein's World of Mathematics, Modular Prime Counting Function

Mathematica

p = Select[Table[7 i + 6, {i, 0, 10^7}], PrimeQ[#] &]; Table[Count[p, x_ /; x < 10^n], {n, 7}] (* Robert Price, May 28 2019 *)

Crossrefs

Cf. A091120, A091121, A091122, A091123, A091124.

Sequence in context: A356393 A036753 A164311 * A331796 A193221 A091121

Adjacent sequences: A091122 A091123 A091124 * A091126 A091127 A091128

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 Hiroaki Yamanouchi, Oct 14 2014

Status

approved