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Search: id:A057332
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| A057332 |
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Numbers of (2n+1)-digit palindromic primes that undulate. |
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2
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OFFSET
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0,1
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COMMENT
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'Undulate' means that the alternate digits are consistently greater than or less than the digits adjacent to them (e.g. 906343609). Smoothly undulating palindromic primes (e.g. 323232323) are a subset and included in the count.
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REFERENCES
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C. A. Pickover, "Wonders of Numbers", Oxford New York 2001, Chapter 52, pp. 123-124, 316-317.
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LINKS
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C. K. Caldwell, Prime Curios! 906343609 and Prime Curios! 1007
C. A. Pickover, "Wonders of Numbers, Adventures in Mathematics, Mind and Meaning," Zentralblatt review
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
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CROSSREFS
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Cf. A046075, A033619, A032758, A039944, A016073, A046076, A046077, A057333.
Sequence in context: A132894 A117917 A027295 this_sequence A071719 A090326 A006234
Adjacent sequences: A057329 A057330 A057331 this_sequence A057333 A057334 A057335
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KEYWORD
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nonn,base,more
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AUTHOR
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Patrick De Geest (pdg(AT)worldofnumbers.com), Sep 15 2000.
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