Primes whose first and last number is 3: Difference between revisions
Primes whose first and last number is 3 (view source)
Revision as of 10:03, 13 November 2021
, 2 years agoadd fermat
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(add fermat) |
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Found 2251 primes beginning and ending with 3 under 1,000,000.
</pre>
=={{header|Fermat}}==
<lang fermat>np := 1;
!(3,' ');
for d = 1 to 5 do
for i = 3 to 10^d-1 by 10 do
n:=3*10^d + i;
if Isprime(n) = 1 then
np:=np+1;
if n<4000 then
!(n,' ');
if Divides(10,np) then !! fi;
fi;
fi;
od;
od;
!!;
!!;
!!('There were ',np,' primes of the form 3...3 below 1,000,000');
</lang>
{{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</pre>
=={{header|FreeBASIC}}==
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