Truncatable primes: Difference between revisions
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m →{{header|REXX}}: added/changed whitespace and comments. |
m →{{header|REXX}}: simplfied two search loops. |
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end /*j*/ |
end /*j*/ |
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/* [↓] find largest left truncatable P*/ |
/* [↓] find largest left truncatable P*/ |
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do L=# by -1 for #; |
do L=# by -1 for #; digs=length(@.L) /*search from top end; get the length.*/ |
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do k=1 for |
do k=1 for digs; _=right(@.L, k) /*validate all left truncatable primes.*/ |
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if \!._ then iterate L /*Truncated number not prime? Skip it.*/ |
if \!._ then iterate L /*Truncated number not prime? Skip it.*/ |
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end /*k*/ |
end /*k*/ |
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leave /* |
leave /*egress, found left truncatable prime.*/ |
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end /*L*/ |
end /*L*/ |
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/* [↓] find largest right truncated P.*/ |
/* [↓] find largest right truncated P.*/ |
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do R=# by -1 for #; |
do R=# by -1 for #; digs=length(@.R) /*search from top end; get the length.*/ |
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do k=1 for |
do k=1 for digs; _=left(@.R, k) /*validate all right truncatable primes*/ |
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if \!._ then iterate R /*Truncated number not prime? Skip it.*/ |
if \!._ then iterate R /*Truncated number not prime? Skip it.*/ |
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end /*k*/ |
end /*k*/ |
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leave /* |
leave /*egress, found right truncatable prime*/ |
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end /*R*/ |
end /*R*/ |
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/* [↓] show largest left/right trunc P*/ |
/* [↓] show largest left/right trunc P*/ |
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