A097426 - OEIS

A097426

Integer part of the circumference of circles with prime diameters.

6, 9, 15, 21, 34, 40, 53, 59, 72, 91, 97, 116, 128, 135, 147, 166, 185, 191, 210, 223, 229, 248, 260, 279, 304, 317, 323, 336, 342, 354, 398, 411, 430, 436, 468, 474, 493, 512, 524, 543, 562, 568, 600, 606, 618, 625, 662, 700, 713, 719, 731, 750, 757, 788, 807

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

OFFSET

1,1

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = floor(prime(n)*Pi).

MAPLE

seq(floor(ithprime(i)*Pi), i=1..100); # Robert Israel, Feb 09 2015

MATHEMATICA

Table[Floor[Pi Prime[n]], {n, 50}] (* Waldemar Puszkarz, Feb 09 2015 *)

PROG