A091117 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A091117

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

0

2, 7, 47, 309, 2412, 19622, 166212, 1440496, 12712315, 113764040, 1029518338, 9401997001

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

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

LINKS

Table of n, a(n) for n=1..12.

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

CROSSREFS

Sequence in context: A072287 A290488 A276649 * A056854 A330149 A117141

Adjacent sequences: A091114 A091115 A091116 * A091118 A091119 A091120

KEYWORD

nonn,more

AUTHOR

Eric W. Weisstein, Dec 19 2003

EXTENSIONS

a(10) from Robert G. Wilson v, Dec 22 2003

a(11)-a(12) from Amiram Eldar, Apr 12 2022

STATUS

approved