Repunit primes: Difference between revisions

=={{header|Nim}}==

{{libheader|Nim-Integers}}

<syntaxhighlight lang="Nim">

import std/strformat

import integers

for base in 2..16:

stdout.write &"{base:>2}:"

var rep = ""

while true:

rep.add '1'

if rep.len > 2700: break

if not rep.len.isPrime: continue

let val = newInteger(rep, base)

if val.isPrime():

stdout.write ' ', rep.len

echo()

</syntaxhighlight>

{{out}}

<pre> 2: 2 3 5 7 13 17 19 31 61 89 107 127 521 607 1279 2203 2281

3: 3 7 13 71 103 541 1091 1367 1627

4: 2

5: 3 7 11 13 47 127 149 181 619 929

6: 2 3 7 29 71 127 271 509 1049

7: 5 13 131 149 1699

8: 3

9:

10: 2 19 23 317 1031

11: 17 19 73 139 907 1907 2029

12: 2 3 5 19 97 109 317 353 701

13: 5 7 137 283 883 991 1021 1193

14: 3 7 19 31 41 2687

15: 3 43 73 487 2579

16: 2

</pre>