Repunit primes: Difference between revisions
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Base 40: [2, 5, 7, 19, 23, 29, 541, 751, 1277]
</pre>
=={{header|Mathematica}}/{{header|Wolfram Language}}==
<lang Mathematica>ClearAll[RepUnitPrimeQ]
RepUnitPrimeQ[b_][n_] := PrimeQ[FromDigits[ConstantArray[1, n], b]]
ClearAll[RepUnitPrimeQ]
RepUnitPrimeQ[b_][n_] := PrimeQ[FromDigits[ConstantArray[1, n], b]]
Do[
Print["Base ", b, ": ", Select[Range[2700], RepUnitPrimeQ[b]]]
,
{b, 2, 16}
]
</lang>
Searching bases 2–16 for repunits of size 2700:
{{out}}
<pre>Base 2: {2,3,5,7,13,17,19,31,61,89,107,127,521,607,1279,2203,2281}
Base 3: {3,7,13,71,103,541,1091,1367,1627}
Base 4: {2}
Base 5: {3,7,11,13,47,127,149,181,619,929}
Base 6: {2,3,7,29,71,127,271,509,1049}
Base 7: {5,13,131,149,1699}
Base 8: {3}
Base 9: {}
Base 10: {2,19,23,317,1031}
Base 11: {17,19,73,139,907,1907,2029}
Base 12: {2,3,5,19,97,109,317,353,701}
Base 13: {5,7,137,283,883,991,1021,1193}
Base 14: {3,7,19,31,41,2687}
Base 15: {3,43,73,487,2579}
Base 16: {2}</pre>
=={{header|Perl}}==
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