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dihedral prime (another Prime Pages' Glossary entries) |
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Glossary:
Prime Pages:
Top 5000:
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A dihedral prime (or dihedral calculator prime) remains prime when displayed on a calculator with 7-segment display whether you hold it up to a mirror, turn the calculator upside down, or turn the calculator upside down and hold it to a mirror. Must contain only the digits 0, 1, 2, 5, or 8. The sequence begins 2, 5, 11, 101, 181, 1181, 1811, ....
Chris Caldwell © 1999-2008 (all rights reserved)
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