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invertible prime (another Prime Pages' Glossary entries) |
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Glossary:
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An invertible prime is a prime which yields a different prime when
the prime is inverted (turned upside down). E.g., 109 becomes 601. It must contain only the digits 0, 1, 6, 8, or 9. Charles W. Trigg (1898-1989) called the pair prime rotative twins.
Chris K. Caldwell © 1999-2012 (all rights reserved)
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