|
Search: id:A160452
|
|
|
| A160452 |
|
Invertible primes of the form 1 followed by a string of 9's. |
|
+0
1
|
| |
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
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]
|
|
EXAMPLE
|
1999, for instance, is a prime which rotated upside down through 180 degrees becomes the prime 6661. Hence 1999 is in the sequence.
|
|
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 this_sequence A113596 A155670 A085770
Adjacent sequences: A160449 A160450 A160451 this_sequence A160453 A160454 A160455
|
|
KEYWORD
|
more,nonn,base
|
|
AUTHOR
|
Lekraj Beedassy (blekraj(AT)yahoo.com), May 14 2009
|
|
|
Search completed in 0.002 seconds
|
