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A160452
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Invertible primes of the form 1 followed by a string of 9's.
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0
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OFFSET
| 1,1
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COMMENTS
| These are values in A055558 whose rotation by 180 degrees occurs in A092571. I have checked all the numbers that correspond to entries in A002957 and can confirm that the next term in this sequence, if it exists, is greater than 2*10^55347-1. [From Dmitry Kamenetsky (dkamen(AT)rsise.anu.edu.au), May 22 2009]
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EXAMPLE
| 1999, for instance, is a prime which rotated upside down through 180 degrees becomes the prime 6661. Hence 1999 is in the sequence.
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CROSSREFS
| Cf. A048890, A055558.
Cf. A092571, A002957. [From Dmitry Kamenetsky (dkamen(AT)rsise.anu.edu.au), May 22 2009]
Sequence in context: A037071 A065582 A055558 * A113596 A155670 A085770
Adjacent sequences: A160449 A160450 A160451 * A160453 A160454 A160455
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KEYWORD
| more,nonn,base
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AUTHOR
| Lekraj Beedassy (blekraj(AT)yahoo.com), May 14 2009
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