23 lines
452 B
Nim
23 lines
452 B
Nim
import math, strformat
|
|
|
|
const N = 999
|
|
|
|
func isPrime(n: Positive): bool =
|
|
if (n and 1) == 0: return n == 2
|
|
if (n mod 3) == 0: return n == 3
|
|
var d = 5
|
|
var delta = 2
|
|
while d <= sqrt(n.toFloat).int:
|
|
if n mod d == 0: return false
|
|
inc d, delta
|
|
delta = 6 - delta
|
|
result = true
|
|
|
|
echo "index prime prime sum"
|
|
var s = 0
|
|
var idx = 0
|
|
for n in 2..N:
|
|
if n.isPrime:
|
|
inc idx
|
|
s += n
|
|
if s.isPrime: echo &"{idx:3} {n:5} {s:7}"
|