login
Number of primes of the form 5k+2 less than 10^n.
0

%I #13 Feb 16 2025 08:32:52

%S 2,7,47,309,2412,19622,166212,1440496,12712315,113764040,1029518338,

%T 9401997001

%N Number of primes of the form 5k+2 less than 10^n.

%C Computed by _T. D. Noe_, Dec 19 2003.

%H Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ModularPrimeCountingFunction.html">Modular Prime Counting Function</a>.

%Y Cf. A045380.

%K nonn,more,changed

%O 1,1

%A _Eric W. Weisstein_, Dec 19 2003

%E a(10) from _Robert G. Wilson v_, Dec 22 2003

%E a(11)-a(12) from _Amiram Eldar_, Apr 12 2022