1,1
Every palindrome with an even number of digits is divisible by 11 (in base 4) and therefore is composite (not prime). Hence there is only one palindromic prime with an even number of digits.
Eric Weisstein: Palindromic Prime.
Cf. A029972, A117699.
Sequence in context: A127474 A078024 A112469 this_sequence A072127 A144966 A119805
Adjacent sequences: A117775 A117776 A117777 this_sequence A117779 A117780 A117781
nonn
Martin Renner (martin.renner(AT)gmx.net), Apr 15 2006
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