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A117772
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Total number of palindromic primes in base 2 below 2^n.
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0
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0, 1, 3, 3, 5, 5, 8, 8, 11, 11, 18, 18, 30, 30, 53, 53, 93, 93, 187, 187, 329, 329, 600, 600, 1080, 1080, 1936, 1936, 3657, 3657, 6756, 6756, 12328, 12328, 23127, 23127, 43909, 43909, 83377, 83377
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| Every palindrome with an even number of digits is divisible by 11 (in base 2) and therefore is composite (not prime). Hence there is only one palindromic prime with an even number of digits.
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LINKS
| Eric Weisstein: Palindromic Prime.
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CROSSREFS
| Cf. A016041, A117697.
Sequence in context: A142712 A046200 A063281 * A026924 A062130 A134361
Adjacent sequences: A117769 A117770 A117771 * A117773 A117774 A117775
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KEYWORD
| nonn,base
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AUTHOR
| Martin Renner (martin.renner(AT)gmx.net), Apr 15 2006
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EXTENSIONS
| a(23)-a(40) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Dec 02 2009
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