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Sequence of primorial primes: Difference between revisions
Add Swift
(Added C++ solution) |
(Add Swift) |
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Line 2,857:
[1, 2, 3, 4, 5, 6, 11, 13, 24, 66, 68, 75, 167, 171, 172, 287, 310, 352, 384, 457]
</pre>
=={{header|Swift}}==
{{libheader|AttaSwift BigInt}}
<lang swift>import BigInt
import Foundation
extension BinaryInteger {
@inlinable
public var isPrime: Bool {
if self == 0 || self == 1 {
return false
} else if self == 2 {
return true
}
let max = Self(ceil((Double(self).squareRoot())))
for i in stride(from: 2, through: max, by: 1) where self % i == 0 {
return false
}
return true
}
}
let limit = 20
var primorial = 1
var count = 1
var p = 3
var prod = BigInt(2)
print(1, terminator: " ")
while true {
defer {
p += 2
}
guard p.isPrime else {
continue
}
prod *= BigInt(p)
primorial += 1
if (prod + 1).isPrime() || (prod - 1).isPrime() {
print(primorial, terminator: " ")
count += 1
fflush(stdout)
if count == limit {
break
}
}
}</lang>
{{out}}
<pre>1 2 3 4 5 6 11 13 24 66 68 75 167 171 172 287 310 352 384 457</pre>
=={{header|zkl}}==
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