OFFSET
1,1
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, 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
KEYWORD
more,nonn,base
AUTHOR
Lekraj Beedassy, May 14 2009
STATUS
approved