Wieferich primes: Difference between revisions
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<!--<lang Phix>(notonline)-->
<span style="color: #008080;">include</span> <span style="color: #7060A8;">mpfr</span><span style="color: #0000FF;">.</span><span style="color: #000000;">e</span>
<span style="color: #008080;">function</span> <span style="color: #000000;">weiferich</span><span style="color: #0000FF;">(</span><span style="color: #004080;">integer</span> <span style="color: #000000;">p</span><span style="color: #0000FF;">)</span>
<span style="color: #7060A8;">
<span style="color: #008080;">return</span> <span style="color: #7060A8;">
▲ <span style="color: #7060A8;">mpz_sub_ui</span><span style="color: #0000FF;">(</span><span style="color: #000000;">p2pm1m1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">p2pm1m1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"Weiferich primes less than 5000: %V\n"</span><span style="color: #0000FF;">,{</span><span style="color: #7060A8;">filter</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">get_primes_le</span><span style="color: #0000FF;">(</span><span style="color: #000000;">5000</span><span style="color: #0000FF;">),</span><span style="color: #000000;">weiferich</span><span style="color: #0000FF;">)})</span>
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