

A105268


Primes which are 1 + strobogrammatic numbers A000787(n): the same upside down.


0



2, 89, 97, 809, 907, 8009, 8699, 9697, 9887, 81119, 98887, 8000009, 9888887, 81111119, 8111111119, 8666699999, 9888888887, 8000000000009, 9888888888887, 98888888888888887, 81111111111111111119, 800000000000000000009
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OFFSET

1,1


COMMENTS

Primes which, upon subtracting one, give numbers which read the same upsidedown. Not to be confused with strobogrammatic primes A007597 such as 181 or 619. Also, 263 is the largest known prime whose square is strobogrammatic. Not to be confused with strobogrammatic squares A018848 such as 109181601. After a(7) this sequence is exemplary, not complete (i.e. missing some values).


LINKS



FORMULA



EXAMPLE

9887 is prime, 9887 = 9886+1 and 9886 turned upsidedown is 9886 again.


CROSSREFS



KEYWORD

base,easy,nonn


AUTHOR



EXTENSIONS



STATUS

approved



