Twin primes: Difference between revisions
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Number of twin prime pairs less than 1,000,000,000 is 3,424,506
Number of twin prime pairs less than 10,000,000,000 is 27,412,679
</pre>
=={{header|Sidef}}==
<lang ruby>func twin_primes_count(upto) {
var count = 0
var p1 = 2
each_prime(3, upto, {|p2|
if (p2 - p1 == 2) {
++count
}
p1 = p2
})
return count
}
for n in (1..9) {
var count = twin_primes_count(10**n)
say "There are #{count} twin primes <= 10^#{n}"
}</lang>
{{out}}
<pre>
There are 2 twin primes <= 10^1
There are 8 twin primes <= 10^2
There are 35 twin primes <= 10^3
There are 205 twin primes <= 10^4
There are 1224 twin primes <= 10^5
There are 8169 twin primes <= 10^6
There are 58980 twin primes <= 10^7
There are 440312 twin primes <= 10^8
There are 3424506 twin primes <= 10^9
</pre>
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