

A117777


Total number of palindromic primes in base 4 below 4^n.


5



2, 3, 6, 6, 16, 16, 45, 45, 142, 142, 435, 435, 1417, 1417, 4802, 4802, 16433, 16433, 57808, 57808, 210708, 210708, 752233, 752233, 2748264, 2748264, 10211513, 10211513, 38013234, 38013234, 140417288, 140417288
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OFFSET

1,1


COMMENTS

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.


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KEYWORD

nonn,base,more


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EXTENSIONS



STATUS

approved



