[seqfan] mirror numbers in A176356

Richard Mathar mathar at strw.leidenuniv.nl
Fri Sep 23 22:00:26 CEST 2011

It would be nice if someone could provide a coherent explanation
or construction of http://oeis.org/A176356 .
i) It seems the author accepts 1 as a prime.
ii) The mirror operation appears to swap the role of 2 and 5
 (why 2 is in the sequence but 5 not remains obscure...)
iii) The mirror operation may also reverse the digits, like a point mirror but
 not a plane mirror (?) This is probably needed to remove leading/trailing zeros.
Would the mirror operation on 115 become 211, a prime?

I cannot find a mix of rules that reproduces the current entries.

Richard Mathar

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