Ludic numbers: Difference between revisions
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Ludic 2000 to 2005: 21475 21481 21487 21493 21503 21511
Triples below 250: (1, 3, 7) (5, 7, 11) (11, 13, 17) (23, 25, 29) (41, 43, 47) (173, 175, 179) (221, 223, 227) (233, 235, 239)
</pre>
=={{header|Sidef}}==
{{trans|Ruby}}
<lang ruby>func ludics_upto(nmax=100000) {
Enumerator({ |collect|
collect(1)
var arr = 2..nmax
while (arr) {
collect(var n = arr[0])
arr.range.by(n).each {|i| arr[i] = nil}
arr.compact!
}
})
}
func ludics_first(n) {
ludics_upto(n * n.log2).first(n)
}
say("First 25 Ludic numbers: ", ludics_first(25).join(' '))
say("Ludics below 1000: ", ludics_upto(1000).len)
say("Ludic numbers 2000 to 2005: ", ludics_first(2005).last(6).join(' '))
var a = ludics_upto(250).to_a
say("Ludic triples below 250: ", a.grep{|x| a.contains_all([x+2, x+6]) }
.map {|x| '(' + [x, x+2, x+6].join(' ') + ')' }
.join(' '))</lang>
{{out}}
<pre>
First 25 Ludic numbers: 1 2 3 5 7 11 13 17 23 25 29 37 41 43 47 53 61 67 71 77 83 89 91 97 107
Ludics below 1000: 142
Ludic numbers 2000 to 2005: 21475 21481 21487 21493 21503 21511
Ludic triples below 250: (1 3 7) (5 7 11) (11 13 17) (23 25 29) (41 43 47) (173 175 179) (221 223 227) (233 235 239)
</pre>
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