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1621 (another Prime Pages' Curiosity) |
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Single Curio View: (Seek other curios for this number) The mouth of a prime volcano. 1621 is a prime that remains prime when preceded and followed by one, two, three, or four 3's:
1621
316213
33162133
3331621333
333316213333
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Submitted: 2009-04-23 00:59:26; Last Modified: 2009-04-23 15:50:33.
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