Primes whose first and last number is 3: Difference between revisions
Primes whose first and last number is 3 (view source)
Revision as of 13:20, 4 March 2023
, 1 year agoadded Arturo
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Drkameleon (talk | contribs) (added Arturo) |
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3733 3793 3803 3823 3833 3853 3863 3923 3943
</pre>
=={{header|Arturo}}==
<syntaxhighlight lang="arturo">firstAndLastIs3?: function [n][
if not? prime? n -> return false
return and? -> 3 = first digits n
-> 3 = last digits n
]
primesWithFirstAndLast3: select 1..4000 => firstAndLastIs3?
loop split.every: 11 primesWithFirstAndLast3 'x ->
print map x 's -> pad to :string s 5
nofPrimesBelow1M: enumerate 1..1000000 => firstAndLastIs3?
print ""
print ["Found" nofPrimesBelow1M "primes starting and ending with 3 below 1000000."]</syntaxhighlight>
{{out}}
<pre> 3 313 353 373 383 3023 3083 3163 3203 3253 3313
3323 3343 3373 3413 3433 3463 3533 3583 3593 3613 3623
3643 3673 3733 3793 3803 3823 3833 3853 3863 3923 3943
Found 2251 primes starting and ending with 3 below 1000000. </pre>
=={{header|AWK}}==
<syntaxhighlight lang="awk">
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