Substring primes: Difference between revisions
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m (→{{header|REXX}}: changed some comments, simplified the code.) |
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say ' index │'center(title, 1 + cols*(w+1) ) /*display the title of the output. */ |
say ' index │'center(title, 1 + cols*(w+1) ) /*display the title of the output. */ |
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say '───────┼'center("" , 1 + cols*(w+1), '─') /* " " separator " " " */ |
say '───────┼'center("" , 1 + cols*(w+1), '─') /* " " separator " " " */ |
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found= 0; idx= 1 /* |
found= 0; idx= 1 /*define # substring primes found; IDX.*/ |
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$= /*a list of substring primes (so far). */ |
$= /*a list of substring primes (so far). */ |
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do j=1 for #; x= @.j; x2= substr(x, 2) /*search for primes that fit criteria. */ |
do j=1 for #; x= @.j; x2= substr(x, 2) /*search for primes that fit criteria. */ |
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end /*k*/ |
end /*k*/ |
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found= found + 1 /*bump the number of |
found= found + 1 /*bump the number of substring primes. */ |
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$= $ right( commas(j), w) /*add a substring prime ──► $ list. */ |
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c= commas(j) /*maybe add commas to the number. */ |
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$= $ right(c, max(w, length(c) ) ) /*add a nice prime ──► list, allow big#*/ |
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if found//cols\==0 then iterate /*have we populated a line of output? */ |
if found//cols\==0 then iterate /*have we populated a line of output? */ |
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say center(idx, 7)'│' substr($, 2); $= /*display what we have so far (cols). */ |
say center(idx, 7)'│' substr($, 2); $= /*display what we have so far (cols). */ |
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if j// 3==0 then iterate /*" " " 3? */ |
if j// 3==0 then iterate /*" " " 3? */ |
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if j// 7==0 then iterate /*" " " 7? */ |
if j// 7==0 then iterate /*" " " 7? */ |
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/* [↑] the above 3 lines saves time.*/ |
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do k=5 while s.k<=j /* [↓] divide by the known odd primes.*/ |
do k=5 while s.k<=j /* [↓] divide by the known odd primes.*/ |
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if j // @.k == 0 then iterate j /*Is J ÷ X? Then not prime. ___ */ |
if j // @.k == 0 then iterate j /*Is J ÷ X? Then not prime. ___ */ |
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