659
This number is a prime.
Single Curio View: (Seek other curios for this number)
The first occurrence of a twin prime pair (659, 661) one of
which is strobogrammatic and the other one invertible when
read on a calculator (7-segment digital display). Note that
the latter when turned upside down becomes also the larger
member of another twin prime pair (197, 199). [Beedassy]
Submitted: 2009-08-31 04:24:41; Last Modified: 2009-08-31 07:09:48.
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