OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..140
MATHEMATICA
pp2Q[n_]:=Module[{idn=IntegerDigits[n], len}, len=Length[idn]; OddQ[len] && idn==Reverse[idn]&&idn[[Ceiling[len/2]]]==2]; Select[Prime[Range[ 140000]], pp2Q] (* Harvey P. Dale, Sep 29 2013 *)
PROG
(Magma) [ p: p in PrimesUpTo(200000000) | IsOdd(d) and D[(d+1) div 2] eq 2 and D eq Reverse(D) where d is #D where D is Intseq(p) ]; // Vincenzo Librandi, Apr 12 2011
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Lekraj Beedassy, Apr 25 2003
EXTENSIONS
Corrected by David Wasserman, Sep 09 2004
STATUS
approved