A097427 - OEIS

A097427

Integer part of the area of circles with prime radii.

12, 28, 78, 153, 380, 530, 907, 1134, 1661, 2642, 3019, 4300, 5281, 5808, 6939, 8824, 10935, 11689, 14102, 15836, 16741, 19606, 21642, 24884, 29559, 32047, 33329, 35968, 37325, 40114, 50670, 53912, 58964, 60698, 69746, 71631, 77437, 83468, 87615, 94024, 100659

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

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..41.

FORMULA

a(n) = floor(Pi*prime(n)^2). - Michel Marcus, Mar 11 2015

EXAMPLE

a(2) = floor(Pi*prime(2)^2) = floor(Pi*9) = 28.

MATHEMATICA

Table[Floor[Pi*Prime[n]^2], {n, 60}] (* Wesley Ivan Hurt, Jan 06 2024 *)

PROG