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A117777 Total number of palindromic primes in base 4 below 4^n. 0
2, 3, 6, 6, 16, 16, 45, 45, 142, 142, 435, 435 (list; graph; refs; listen; history; internal format)
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.

LINKS

Eric Weisstein: Palindromic Prime.

CROSSREFS

Cf. A029972, A117699.

Sequence in context: A129650 A007894 A102625 * A049297 A056391 A056430

Adjacent sequences:  A117774 A117775 A117776 * A117778 A117779 A117780

KEYWORD

nonn,base

AUTHOR

Martin Renner (martin.renner(AT)gmx.net), Apr 15 2006

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Last modified February 16 14:07 EST 2012. Contains 205930 sequences.